Orologi Solari n. 33

Dear friends, a new issue of the Italian magazine Orologi Solari is available for download from the usual site http://www.orologisolari.eu/. Here is the list of articles together with a short abstract: 1. - "The meridian line of the Stock Exchange Building in Trieste: an (easily) solvable

Fwd: The ancient Roman alternative to daylight savings time

Hi, A nice, but unsurprising, article on Roman sundials from the BBC: https://www.bbc.com/future/article/20240328-the-ancient-roman-alternative-to-daylight-savings-time best wishes, Peter ---

Re: A sundial in Seville

Here you can see the incorrect gnomon reposition, quite well anti-vandalism! https://relojesdesol.info/gallery2/gallery/v/espana/and/sev/ES_AND_SEV_Sevilla-009-03_Plaza-de-America_Wiki4.jpg.html in the following album picture with the original gnomon. Regards, Luis El 22/03/2024 a las 15:40,

Re: A sundial in Seville

it is also here: www.sundialatlas.eu/atlas.php?sun=ES877 Fabio Savian Il 22/03/2024 15:40, Douglas Bateman via sundial ha scritto: Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC

Re: A sundial in Seville

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Plaza de America. 

Odp: sundial Digest, Vol 215, Issue 5

www.google.pl https://www.google.pl/maps/place/Glorieta+del+Reloj+de+Sol/@37.3712572,-5.9887067,19.04z/data=!4m6!3m5!1s0xd126d2a796be3b9:0x1c3f079eac69690a!8m2!3d37.3712046!4d-5.9880001!16s%2Fg% Best Darek Oczki 52N 21E (Warszawa) Dnia 22 marca 2024 15:41

RE: Photograph of the Princess of Wales

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Aren't we in danger here of confusing 'light' and

RE: sundial Digest, Vol 215, Issue 2

As Professor Joad used to say, it all depends what you mean by ‘direction’. A shadow simply falls on a surface. It doesn’t have a direction. We need a clearer statement of the question. John Foad From: sundial On Behalf Of John Lynes Sent: Monday, March 11, 2024 6:24 PM To: Bill

Re: sundial Digest, Vol 215, Issue 2

I think there's a simpler solution. In the UK at noon the shadow of the style on a horizontal sundial faces North - away from the sun. Turn the style through 180 degrees in a horizontal plane, and its shadow at noon will face South - towards the sun! John Lynes On Mon, 11 Mar 2024 at 17:12, Bill

Re: sundial Digest, Vol 215, Issue 2

My guess on this one (without using mirrors): Point the bottom of an empty can at the sun. The shadow inside the can now points in the direction of the sun, though the definition of "in the direction of the sun" in this case is debatable. -Bill On Mon, Mar 11, 2024 at 9:33 AM Chris Lusby Taylor

Re: sundial Digest, Vol 215, Issue 2

Re: Photograph of the Princess of Wales (Frank King) Frank is being his usual pedantic self, which is always welcome, but the police statement can more charitably be taken to say that shadows fall in a continuation of the straight line from the light source to the illuminated object. The edge of

Photograph of the Princess of Wales

Dear All, There is much talk about the recent photograph of the Princess of Wales and her children. In one newspaper I read that "a former digital forensics officer for Dorset Police said... 'In a true image, the shadows will all be in the same direction as the light'" Huh! He has

Latest issue of the “Cadrans solaires pour tous” magazine

Dear colleagues, I am glad to inform you that the Spring issue of the “Cadrans solaires pour tous” magazine (including a Table of contents in English) is now available for free download from https://www.cadrans-solaires.info/le-magazine/. This issue namely announces the launch of our 2024

Re: World Sundial Day

This is a clever initiative that our group and magazine will support All the best Roger Torrenti Author of the MOOC cadrans solaires (free online course on sundials) Founder and editorial manager of the « Cadrans solaires pour tous » (sundials for all)

Re: World Sundial Day

The spanish AARS and myself are in favor of the WSD initiative. It may be a boost to sundials interest all around the world. Counting with your support (members and associations). You can also support it voting at Change.org: https://chng.it/g8rkJVQYk6 Please diseminate. Thanks and regards,

Re: World Sundial Day

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Dear Sundial friends, As Manolo Pizarro already

World Sundial Day

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hello everyone: >From the "Reloj Andalusí", an

World Sundial Day

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hello everyone: >From the "Reloj Andalusí", an

Octahedral Sundials

Dear All, I am trying to find examples of sundials that have been set out on some or all the faces of a REGULAR OCTAHEDRON. There are many examples of Dodecahedra and Icosahedra but I can't find ANY Octahedra. If you know of any, please share the knowledge!! Very best wishes Frank Frank King

Zoom Sundial Event - Today 17:00 UTC

Dear All, Later today, with Martins Gills, I am hosting a Sundial Zoom Event. Here is the Zoom link: Invitation... Frank King - BSS is inviting you to a scheduled Zoom meeting. Topic: BSS December 2023 Bulletin Follow-up Time: Jan 24, 2024 17:00 London Join Zoom Meeting

Orologi Solari n. 32

Dear friends, a new issue of the Italian magazine Orologi Solari is available for download from the usual site http://www.orologisolari.eu/. Here is the list of articles together with a short abstract: 1. - "Gnomonics and Artificial Intelligence (ChatGPT)" by Gian Casalegno How much does

Re: Finding GB patents (off list)

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Good morning on the last day of 2023. Many thanks

New Dutch sundial book is out

Dear sundial friends, As many of you may know, I have written and have been teaching an introductory sundial course for members of the Netherlands' and Flemish Sundial Societies. Now I have reworked the course material into a book aimed at a general, Dutch speaking readership. It is the first

Finding GB patents (off list)

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Good afternoon, As part of my research into the

Re: Substitute for DeltaCad?

Freecad and nanocad work well, power draw also works except when I used it, I had to write my own trig functions. However I never exported the dial plates from them as I can and still do use deltacad. I have also used progecad. My book "Programming Shadows" has sample code for them, as well as

Substitute for DeltaCad?

Hello All, DeltaCad does not function fully on my Mac M1Pro (Mac silicon based). It will not save in .dxf format, so I can't move things out of the .dc proprietary DeltaCad files into Adobe Illustrator. DeltaCad has been discontinued by the developer. Does anyone have a work-around, or a

Re: Winter issue of the “Cadrans solaires pour tous” magazine

Thank you Dennis, The English translation of the solution of the “énigme” provided in the magazine is “You may have thought of a Mass dial but it is not one… A Mass dial is typically made up (photo below) of a semi-circle (sometimes a complete circle) divided into regular sectors and with a

RE: Winter issue of the “Cadrans solaires pour tous” magazine

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Dear RogerWith reference to une enigme on page 34,

Winter issue of the “Cadrans solaires pour tous” magazine

Dear colleagues, I am very glad to inform you that the Winter issue of the “Cadrans solaires pour tous” magazine is now available for free download from https://www.cadrans-solaires.info/le-magazine/ Best regards Roger Torrenti ---

Beginners' sundialing course / North American Sundial Society

NASS is pleased to announce the upcoming third instance of Elements of Dialing, our introductory course about sundials, their history, and the science that makes them work. The free 13-lesson course, intended for those are new to sundialing, runs from January 2024. The course coordinator will

Mobius Strip sundial at Brown University

https://www.brown.edu/news/2019-05-08/sundial -- --- https://lists.uni-koeln.de/mailman/listinfo/sundial

Solaris floating sundial

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I am hoping for more information about a French made

Re: Re : Difference between types of equinox

My thanks go to Bill and Hervé for responding to my equinox question. The information they provided indicates that the change in definition of astronomical equinox, from delta = 0 to lambda = 0/180, had no practical impact as far as sundialing is concerned (only a few seconds). For the

Re : Difference between types of equinox

Hi Steve, I think that some answers to your questions can easily be found on the following link of the French " Institut de Mécanique Céleste et de Calcul des Éphémérides" ( IMCCE) : https://www.imcce.fr/newsletter/html/newsletter.html#current-article2 They publish (in French) a free

Re: Difference between types of equinox

I seem to recall Fred contributing to a similar conversation a few years ago. Speaking from ignorance, I think the sun will not be at exactly 0 declination at 180 longitude because the moon can pull the earth above or below the ecliptic depending on the lunar orbit. I think the effect is tiny,

Difference between types of equinox

Hello, From what I've read recently, there are three variants of an equinox: - Modern astronomical definition: apparent geocentric longitude of the sun is 0 or 180 degrees. - The older astronomical definition (often used in dialling) : solar declination is 0 degrees. - 'Temporal equinox':

“Cadrans solaires pour tous” Autumn issue

Dear colleagues, I am very glad to inform you that the Autumn issue of the “Cadrans solaires pour tous” magazine (n°9) is now available for download from https://www.cadrans-solaires.info/le-magazine/. Best regards Roger Torrenti ---

Orologi Solari n. 31

Dear friends, a new issue of the Italian magazine Orologi Solari is available for download from the usual site http://www.orologisolari.eu/. Here is the list of articles together with a short abstract: 1. - "The level of the Meridian Line of Augustus: two phases or only one?" by Paolo Albéri

Re: [SPAM] Largest stone sundial?

Dan-George, The earth globe itself. Willy Leenders Hasselt Belgium > Op 9 aug. 2023, om 12:30 heeft Dan-George Uza het > volgende geschreven: > > Hello, > > Does anybody know what the largest one-piece stone sundial in the world is? > > Thanks, > > > -- > Dan-George Uza >

Largest stone sundial?

Hello, Does anybody know what the largest one-piece stone sundial in the world is? Thanks, -- Dan-George Uza --- https://lists.uni-koeln.de/mailman/listinfo/sundial

AW: Interesting Moon Dial

Hallo Mark, excellent! Thank you so much for the NASS info and your explanation. I will asap dig into that (and hope to find the Nass link). Thank you again and kind regards Siegfried Siegfried Netzband Hebelstr. 12 75233 Tiefenbronn Tel: 07234 2802 Fax: 07234 942909 Mob: 0151 53083636 /

Re: Interesting Moon Dial

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hello Siegfried, This is a wonderful dial.  The

RE: Off topic: English text explanation please

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Hello all, I am very happy with all the kind and

Interesting Moon Dial

Dear sundial friends, came across an interesting moon dial which is quite different from all the other moon dials I did see up to now ( ). However: I cannot read it, neither do I understand the way they calculated the lines on

RE: Off topic: English text explanation please

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Steve, Peter, Jack, Thanks so much for your

RE: Off topic: English text explanation please

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I am a serious amateur musician, but unlike Peter,

Re: Off topic: English text explanation please

Dear Rudolf, I share your interest in 17th century madrigals.  (Although I'm a firm non-smoker, one of my favourites has the line "tobacco is like love..."). My interpretation is that this is a compressed form of poetical expression. Decompressed, I think, it would be: […] thus did they

Off topic: English text explanation please

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Dear sundial friends, I would ask one totally

Auction of potential interest

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- Good evening, There are many items of potential

RE: Question About Measuring Wall Declination

You can build one of these. https://www.mysundial.ca/sdu/sdu_wall_declinometer.html From: sundial [mailto:sundial-boun...@uni-koeln.de] On Behalf Of Michael Ossipoff Sent: July 1, 2023 1:07 PM To: Jeffery Brewer; sundial list Subject: Re: Question About Measuring Wall Declination I

Re: Question About Measuring Wall Declination

I realize that you’ve already gotten good answers, but I’d like to say a few things too. … I’m really late replying, because I’ve been trying to figure out how to word answers to a few long assertion-posts from the usual confused self-sure kids at a philosophical forum. After this time, I’m

Re: Question About Measuring Wall Declination

Hi Jeffery you are actually calculating the horizontal angle indicated as 'angolo' on the diagram below ie. deviation of the Sun from the wall under consideration. Hope this helps, Alexei [image: image.png] On Mon, 26 Jun 2023 at 16:37, Jeffery Brewer wrote: > I'm attempting to measure the

Question About Measuring Wall Declination

I'm attempting to measure the declination of a wall using a method described on this web page of The Sundial Primer https://www.mysundial.ca/tsp/wall_declination.html (also described in "Sundials: Their Theory and Construction" by Albert E Waugh Chapter 10). Referring to Figure 1 of The Sundial

Latest issue of the "Cadrans solaires pour tous" magazine

Dear colleagues, I am very glad to inform you that the Summer issue (#8) of the « Cadrans solaires pour tous” magazine is now available for download from https://www.cadrans-solaires.info/le-magazine/. This issue namely includes the results of our “2023 photo contest”. Best regards Roger

World and Hour in Roman Minds

Dear Dialists, I seek an independent review of Richard J.A. Talbert’s recent book "World and Hour in Roman Minds: Exploratory Essays". All I've found online is the the publisher's summary, reproduced on various sites. Can anyone steer me to a review source or, if you've read it yourself,

Re: DeltaCad has been discontinued

I would offer for consideration several options that work well and are easy to program and use; some are more functional than others. I have tried and written code for all of them, and I discuss them on my website, as well as having functioning code for various dial types. NanoCAD

Re: DeltaCad has been discontinued

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I would offer for consideration several options that

Re: DeltaCad has been discontinued

Good morning Dan-George, as an alternative one may wish to try https://www.qcad.org/en perhaps. Alexei On Fri, 5 May 2023 at 07:34, Dan-George Uza wrote: > Hello, > > I've just found out that DeltaCad has been discontinued so you won't be > able to download the demo any longer. I find this

DeltaCad has been discontinued

Hello, I've just found out that DeltaCad has been discontinued so you won't be able to download the demo any longer. I find this very sad, it was a very simple CAD software with many useful sundial macros available. However, it seems that you will still be able to download your purchased copy.

Fwd: analemmatic sundial plan generator

-- Forwarded message -- From: *David Andersson* Date: Tuesday, May 2, 2023 Subject: Re: analemmatic sundial plan generator To: Donald Christensen Hi there, Donald If you are looking for diagram-style plans (with overlaid measurements), as opposed to just spreadsheet-type

Re: analemmatic sundial

Hi Donald, You may want to consider CADSOL online, an online software (no need to download anything) developed by Jean-Luc Astre (instructions in English and free of use). https://cadsol.web-pages.fr/CadsolOnLine/sources/colmod2023-04-25.html It can be referred to for different types of

Re: analemmatic sundial

What happened to your "Sundials for Learning" business (a few years back) - when you were offering plans for Analemmatic Sundials to schools ? It seems to me, that you already had the appropriate software. Keith Christian. On 2023-05-01 06:44, Donald Christensen wrote: I'm looking for a

Re: analemmatic sundial

Thank you. I forgot to specify that it needs to be able to run on osx On Mon, May 1, 2023 at 4:00 PM Kurt Niel wrote: > Hi Donald, > > www.helson.at > > A very supportive SW with a lot of different types of sundials! > > Kurt > > Donald Christensen schrieb am Mo., 1. Mai > 2023, 07:44: > >>

Re: analemmatic sundial

Hi Donald, www.helson.at A very supportive SW with a lot of different types of sundials! Kurt Donald Christensen schrieb am Mo., 1. Mai 2023, 07:44: > I’m looking for a program to calculate an analemmatic sundial. Can anybody > help? > > Cheers > Donald Christensen > 0467 332 227 > > If you

analemmatic sundial

I’m looking for a program to calculate an analemmatic sundial. Can anybody help? Cheers Donald Christensen 0467 332 227 If you focus on what you lack, you'll lose what you have. If you focus on what you have, you gain what you lack. ---

Re: Seeking information on "F.G. Cheney"

Hi, Thanks! Steve On 2023-04-20 1:36 a.m., Hendrik Desmet wrote: I found this: "(...) Eight years later, Frank purchased *Cheney Foundry*, a small company in Minneapolis that poured aluminum and brass, from its retiring owner in 1963. Frank managed the foundry, and Lois managed the

Re: Seeking information on "F.G. Cheney"

I found this: "(...) Eight years later, Frank purchased *Cheney Foundry*, a small company in Minneapolis that poured aluminum and brass, from its retiring owner in 1963. Frank managed the foundry, and Lois managed the office.(...) See https://carleyfoundry.com/about/history Kind regards Hendrik

Re: Frank Cheney

Excellent! That'll be him. Thanks very much, Steve On 2023-04-19 3:55 p.m., Patrick Vyvyan wrote: This quote is from the North American Sundial Society description of a sundial in the Old Rose Garden of the Botanical Garden University of California at Berkeley "The armillary dial is made

Frank Cheney

This quote is from the North American Sundial Society description of a sundial in the Old Rose Garden of the Botanical Garden University of California at Berkeley "The armillary dial is made of red bronze and rests on a quarried stone pedestal. The equatorial ring includes hour lines with

Seeking information on "F.G. Cheney"

Hello, My question is mostly for dialists in the USA - can anyone tell me if there was a dial maker called Cheney (or a foundry that had dials in their product line) active in the early 1960s, possibly in the San Francisco area? I'm trying to trace the origins of a 1961 dial that has

Orologi Solari n. 30

Dear friends, a new issue of the Italian magazine Orologi Solari is available for download from the usual site http://www.orologisolari.eu/. Here is the list of articles together with a short abstract: 1. - "The obelisk of Augustus. A detail so far ignored: deductions and updates" by Paolo

Re: Adjusting dial to new location

I mentioned several alignments, the correction of any one of which could be used to determine how much the dial-plate should be rotated in its own plane (either before or after the tip). Most recently I suggested the altitude of the pointing-direction of the style. But it seems to me that it

Re: Adjusting dial to new location

I retract the addendum. I wrote it with the notion that the noon-line should be under the style. …as if the dial were intended to read for its own longitude. So, sorry—disregard the addendum (…as you probably already have). The dial-plate’s rotation in its own plane should be to correct the

Re: Adjusting dial to new location

For complete generality: If your sundial was made for a latitude greater then yours by an amount called “DeltaLat” (which could be positive or negative), & if you want the dial to give LTST for a longitude 7 degrees west of yours (maybe because that’s your standard-meridian), then: After the

Re: Adjusting dial to new location

Yes, I spoke of a special-case in which you’re 7 degrees east of your standard-meridian. …for a concrete example. But the rest of what I said was for the general-case in which you want the dial to read in the LTST at your standard-meridian. But yes, I didn’t speak of when the dial is made for a

Re: Adjusting dial to new location

On 2023-04-08 8:52 p.m., Michael Ossipoff wrote: I know you said you wanted a link, not instructions, but people have been suggesting how to achieve dial-autocorrection to Local True Solar Time (LTST) at the standard-meridian, instead of one’s own meridian. So I felt that it would be

Re: Adjusting dial to new location

Addendum: … Instead of finding the dial-plate rotation in its own plane that corrects the style’s pointing-direction, it might be easier to, instead, find the dial-plate rotation in its own plane that puts the dial’s noon-line in the meridianal-plane….i.e. gives that noon-line an azimuth of

Re: Adjusting dial to new location

Steve— … I know you said you wanted a link, not instructions, but people have been suggesting how to achieve dial-autocorrection to Local True Solar Time (LTST) at the standard-meridian, instead of one’s own meridian. So I felt that it would be justified to comment about it. … …even though

Re: Adjusting dial to new location

Contrary to what I suggested yesterday, the adjustment of a sundial to give LTST at the standard-meridian doesn’t require solution of a system of equations. It’s a straightforward coordinate-transformation: … Say the dial-plate is circular. For a sphere that circumscribes that dial-plate, the

Re: Adjusting dial to new location

[quote] Assuming that a dial should read only local solar time is a rather limited view. [/quote] … :-) What? … So, an expressed preference is a “limited view”? :-) … LTST stands for Local-True-Solar-Time. … A dial that reads in LTST at your latitude *at your standard meridian*…instead

Re: Adjusting dial to new location

By “auto-correction”, I refer modification of the dial, so that it will directly read Local-True-Solar-Time (LTST) at your latitude at your standard-meridian instead of where the dial is. … Auto-correcting for longitude by rotating & tipping the dial is a “retrofit” longitude auto-correction, as

Re: Adjusting dial to new location

Depending on your choice of rotation axes, only two rotations are needed, one for the elevation of the pole and one around the gnomon for longitude correction. These are the two that correspond to the actual changes needed. If you are using the three orthogonal x, y, and z axes, then three

Re: Adjusting dial to new location

Assuming that a dial should read only local solar time is a rather limited view. While it might be of interest to the dial purist, it is not particularly useful to the general population and often requires a lot of explanation. And it makes us seem like an eccentric clique. The dial produces a

Re: Adjusting dial to new location

At a new location, a dial must end up with the style parallel to the polar axis - but how do you achieve that using a wedge? Assuming you start with the dial at the new location on a horizontal surface with the sub-stile line on the local meridian, the required sequence is to rotate it about

Fwd: Adjusting dial to new location

-- Forwarded message - From: Michael Ossipoff Date: Tue, Apr 4, 2023 at 09:53 Subject: Re: Adjusting dial to new location To: The combination of rotation about the vertical axis, & then non-meridianal tipping, hadn’t occurred to me. …to directly read the Local True Solar Time

Re: Adjusting dial to new location

The public stationary sundial in my town is mounted normally for Local True Solar Time. It’s correction-plaque gives un-adjusted EqT, with an instruction to add a certain number of minutes for the longitude-correction. On Sun, Apr 2, 2023 at 17:26 Steve Lelievre wrote: > You don’t need two

Re: Adjusting dial to new location

On Tue, Apr 4, 2023 at 08:45 wrote: > Rotating the dial plate around a vertical axis is wrong because the hours > lines are not at constant angles. > > Rotating the whole dial around the polar axis is the correct way to adjust > a local solar time dial to a different longitude, the time zone

Re: Adjusting dial to new location

Rotating the dial plate around a vertical axis is wrong because the hours lines are not at constant angles. Rotating the whole dial around the polar axis is the correct way to adjust a local solar time dial to a different longitude, the time zone center, for example. Having a dial show the

RE: Adjusting dial to new location

Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die eigentliche Nachricht steht dadurch in einem Anhang. This message was wrapped to be DMARC compliant. The actual message text is therefore in an attachment.--- Begin Message --- I think I must be missing something here. I cannot

Re: Adjusting dial to new location

Hi Steve, I use to be a member of the NASS but I am retired now. And due to funds I was not able to renew my membership. So I don't have access to Fred Sawyer's and Bill Gottesman's article. Maybe the Article and the drawing of the Earth with sundials could be used to explain this?

Re: Adjusting dial to new location

Hi all, Is the Sundial Mailing list able to accept images? Below is how we can understand how sundials work. A sundial is a mechanical clock. Sundials are geared to the largest clock in the world, Earth. Look at it from a mechanical point of view on a spinning Earth. Draw the earth and cut

Re: Adjusting dial to new location

Hi all, This link I think is a good way of showing. How we can understand how sundials work. A sundial is a mechanical clock. Sundials are geared to the largest clock in the world, Earth. Look at it from a mechanical point of view on a spinning Earth. Draw the earth and cut out paper

Re: Adjusting dial to new location

That surprises me too. I’d have expected that the only differences would be that the dial is numbered counterclockwise, & that north & & south are replaced with poleward & equatorward. On Mon, Apr 3, 2023 at 16:47 Steve Lelievre wrote: > Hi, Roderick, > > My home internet connection is still

Re: Adjusting dial to new location

Hi, Roderick, My home internet connection is still non-functional so I can't fix it yet, but it does seem that I will have to add an extra test to handle southern hemisphere locations and reducing latitudes. Actually, I originally had a southern hemisphere check in there but took it out

Fwd: Adjusting dial to new location

-- Forwarded message - From: Date: Mon, Apr 3, 2023 at 07:35 Subject: Re: Adjusting dial to new location To: Michael Ossipoff Local Solar Time is one of the things that a dial can do. But I might want Time Zone time. Or I might want Paris France time. A dial can do both with a

Fwd: Adjusting dial to new location

-- Forwarded message - From: Michael Ossipoff Date: Mon, Apr 3, 2023 at 14:12 Subject: Re: Adjusting dial to new location To: Of course, but I’d always make the dial to directly show Local True Solar Time. I’d never incorporate a built-in longitude correction. My use of EqT &

Fwd: Adjusting dial to new location

-- Forwarded message - From: Michael Ossipoff Date: Mon, Apr 3, 2023 at 14:04 Subject: Re: Adjusting dial to new location To: Rod Wall Yes, because you’ve moved the dial south, you tip it south. The wedge-use is as you say, but I’d prefer a flat, vertical-edge shim, because it

Re: Adjusting dial to new location

Steve tells me that the lack of longitude correction instructions was due to my choice of 'local solar time' as the time indication. When I use 'UTC-5' I get the instructions. --- On 2023-04-02 21:30, kool...@dickkoolish.com wrote: I tried the app. I used 40, -75 and 45, -70. It just said to

Re: Adjusting dial to new location

Hi Steve, For both examples below with all sundials at the same Longitude. The instructions indicate: Place the wedge-sundial assembly on a horizontal surface in a nice sunny location. *Start with the higher end of the wedge to the north* and the sides aligned on a north-south line and the

Re: Adjusting dial to new location

Tipping the dial-plate for latitude makes it exactly as if the dial were at the latitude it was made for. No need for a 2nd wedge. If the new longitude differs from the old on, then just adjust your longitude correction constant. + 4 minutes for every degree more west of your standard meridian.

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