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
tude-offset way7 degrees.
That correction gives a simpler expression for the necessary dial-plate
rotation in its own plane. (…which can be done before or after the tip).
On Tue, Apr 11, 2023 at 08:52 Michael Ossipoff
wrote:
> I retract the addendum. I wrote it with the notion that the no
the style’s
pointing-direction (in altitude or azimuth), as I originally said &
described.
Correcting its altitude would give an easier equation-solution.
On Sat, Apr 8, 2023 at 21:25 Michael Ossipoff
wrote:
> Addendum:
>
> …
>
> Instead of finding the dial-plate rotati
8 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 j
for a different latitude
*and* you want standard-meridian LTST.
I thought that it was just about getting the standard- meridian LTST.
…something I wouldn’t do anyway.
On Sun, Apr 9, 2023 at 14:09 Steve Lelievre
wrote:
>
> On 2023-04-08 8:52 p.m., Michael Ossipoff wrote:
>
> I know you sai
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
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
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
ularly 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 shadow. The hour lines and other indications are strictly our
> interpretation and a particular one should not be forced on everybody else.
>
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
-- 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
adjustment and that Equation of Longitude can be handled there to give
>> Standard Time (or DST).
>>
>> But anyway, my inquiry was to seek an online wedge calculator. Nobody
>> identified one and a week seemed an adequate wait for responses, so I've
>> just written on
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
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
-- 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
-- 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
-- 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
se? It sounds like a good project for a 3-D printer.
>
>
>
> Jack
>
>
>
> *From:* sundial
> *On Behalf Of *Steve Lelievre
> *Sent:* Sunday, April 2, 2023 5:16 PM
> *To:* Michael Ossipoff
> *Cc:* Sundial List
> *Subject:* Re: Adjusting dial to new location
>
ten one. Anyone who's interested, please see
>
>
> https://sundials.org/index.php/teachers-corner/sundial-construction/367-easy-dial-adjustment-for-your-latitude
>
> Cheers,
>
> Steve
>
> On 2023-04-02 1:41 p.m., Michael Ossipoff wrote:
>
> I just want to
I just want to mention that the shim under the north or south edge of the
dial is only for latitude. Longitude is corrected-for by changing the
constant term of the Sundial-Time to Clock-Time conversion.
But usually Sundial-Time, Local True Solar Time, is what I’d want from a
sundial.
On Sun,
-- Forwarded message -
From: Michael Ossipoff
Date: Thu, Feb 16, 2023 at 14:12
Subject: Re: equation of time on Earth
To: Kevin Karney
Yes, French hours (Local True Solar Time), Babylonian hours, Italian hours
& can be gotten from a sundial directly, without referring to an
I'd rather keep the leap-second. The fluctuation that it brings to
clock-time only has a 1-second peak-to-peak amplitude. That's completely
insignificant to dialists. & also entirely insignificant for such
things as Sunrise, Sunset, Civil-Twilight & Nautical Twilight, where a
cloud or a
What’s wrong with brass changing its color with weathering? Isn’t that part
of the appeal of brass?
On Sat, Apr 30, 2022 at 8:56 AM Dan-George Uza
wrote:
> Hi,
>
> Iron rusts and brass changes color, but what about different metals used
> as gnomons, pros & cons?
>
> What would be the
# 5, in my most recent post, should say:
.
To determine the hour-angle of the mean-Sun:
.
1. Convert the minutes in the LMT to a fraction of an hour.
.
2. Subtract 12 hours from the LMT, or add 12 hours to the LMT…whichever
gives a number between 0 & 24.
.
3. Multiply the result by 15.
(I’d post this as a “reply” to my existing topic, but that thread doesn’t
show up in my display, & so it’s necessary to post this as a new topic.)
.
Yesterday I described a way of estimating EqT, which depended on the fact
that the EqT is zero on some known day. But EqT can be also estimated
ains on the actual
Sun in R.A.
So when the mean Sun's R.A. gain over the actual Sun during the period of
interest is determined, & multiplied by 4, you must change the sign of that
difference to get the EqT.
On Sat, Oct 29, 2022 at 8:48 PM Michael Ossipoff
wrote:
> There was something posted rec
There was something posted recently about how to calculate the Solar
ecliptic-longitude, & thereby the Equation of Time (EqT).
.
(I should emphasize, that, when the Solar ecliptic-longitude is determined
as described below, of course the Solar declination can be gotten from it
by the method that
Okay, that’s good to hear. …& thanks clearing it up.
On Sun, Oct 16, 2022 at 3:54 PM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:
> Michael,
>
> On 2022-10-16 1:40 p.m., Michael Ossipoff wrote:
> > Thank you for mentioning that I answered Steve's q
Frank--
Thank you for mentioning that I answered Steve's question. ...something
not acknowledged by Steve for some reason.
I didn't notice that when I first read your post. Thanks for setting the
record straight !
So, to the list I just want to clarify that, when Steve asked how to
determine
[quote]
At the moment we are in Vintagarious, the
first month, and you will see that each
day has the symbol for Aries.
[/quote]
Then you have an error, because Vendemiaire doesn't roughly approximate
Aries. Vendemiaire
roughly approximates Libra.
As for the nature of the French Republican
& an
equinox…90 degrees along the ecliptic.
On Fri, Oct 14, 2022 at 11:33 PM Michael Ossipoff
wrote:
> BTW, I like sundials that tell the ecliptic-months, Aries thru Pisces.
>
> …for which one would need the Solar declinations for the beginning of each
> ecliptic-month, & pref
BTW, I like sundials that tell the ecliptic-months, Aries thru Pisces.
…for which one would need the Solar declinations for the beginning of each
ecliptic-month, & preferably also for some fractions of each
ecliptic-month, such as 1/3 & 2/3.
On Fri, Oct 14, 2022 at 10:16 PM Michael
-- Forwarded message -
From: Michael Ossipoff
Date: Fri, Oct 14, 2022 at 10:16 PM
Subject: Re: How to turn ecliptic longitude into solar declination?
To: Steve Lelievre
Or you could just use the ecliptic longitude, reckoned as usual from the
Vernal Equinox…multiply its sine
Multiply the sine of ecliptic longitude (reckoned forward or backwards from
the nearest equinox) by the sine of 23.438 or whatever the current
obliquity’s exact value is).
Take the inverse sine of the result.
On Fri, Oct 14, 2022 at 4:57 PM Steve Lelievre <
steve.lelievre.can...@gmail.com>
Oops!! At the time of writing, it's still only September 29th in Greenwich.
---
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grees, or 350 years, from the Age of Aquarius. That
won’t due, for wide-acceptance.
.
Though I like including the Apsidal-Age in addition to the
Precessional-Age, I wouldn’t press for that change, because I haven’t heard
any agreement on that.
.
25 September
.
5 SEVEN-Libra
.
3rd of Wheezy
.
Mi
uts.net
But explore the larger website, starting from its homepage. It's
fascinating.
5 SEVEN-Libra
Michael Ossipoff
---
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ooks like more than a magazine-article, & looks to have a more
detailed description of the device.
Michael Ossipoff
<https://www.imeko.org/publications/tc4-Archaeo-2017/IMEKO-TC4-ARCHAEO-2017-008.pdf>
On Sat, Sep 24, 2022 at 1:22 PM graham stapleton via sundial <
sundial@uni-koeln.de&
f Vendemiaire (FRC)
.
3rd of Wheezy (FRC)
.
5 SEVEN-Libra (UCC)
.
5th of Libra (North Solstice Ecliptic-Months Calendar)
.
Michael Ossipoff
,
(FRC is more accurate right now because its starting day is so recent.)
On Wed, Sep 21, 2022 at 3:52 PM Steve Lelievre <
steve.lelievre.can.
, but my mentioning it is not?
.
You said:
.
[quote]
On 2022-09-21 3:22 a.m., Michael Ossipoff wrote:
.
[quote]
Yes some of you over there like to rely on exaggeration as an attack-tactic
[/quote]
I hope it's unintentional on your part, but the words "some of you over
there" h
Yes some of you over there like to rely on exaggeration as an
attack-tactic, but in this instance it isn’t an exaggeration. You keep
calling Gregorius a hero, but that isn’t an exaggeration.
Gregorius & his astronomers saved the Julian Calendar when they restored
it’s original seasonal
Again my reply to Favio didn’t post. I don’t know why, but now I’m trying
again to post it:
,
Favio—
.
You wrote:
.
[quote]
The idea of reviving the Rep. Calendar (together with the corresponding
Greg. Calendar) is that of an intellectual fun
[/quote]
.
Undenniably so.
.
[quote]
If
On Tue, Sep 20, 2022 at 4:44 AM Frank King wrote:
> Dear Michael,
>
> I agree with much of what you say about the
> French Republican Calendar but, importantly,
> you say nothing about how this calendar
> relates to sundials. Let me explain in
> simple steps:
>
> 1. Sketch an outline vertical
I tried postings replies to both Frank & Favio in one post, & it didn’t
work. Neither reply posted. So now I’m starting over, postings them
sseparately. This reply is to Frank, & my reply to Favio will immediately
subsequently be posted. I hope that these replies will post this time.
Hi Frank—
On Tue, Sep 20, 2022 at 9:08 AM fabio.sav...@nonvedolora.it <
fabio.sav...@nonvedolora.it> wrote:
> Dear Michael
>
> The idea of reviving the Rep. Calendar (together with the corresponding
> Greg. Calendar) is that of an intellectual fun and I would be amazed to
> discover other implications.
>
>
-- Forwarded message -
From: Michael Ossipoff
Date: Sun, Sep 18, 2022 at 2:50 PM
Subject: Re: Republican Calendar, Year 231
To: Jack Aubert
I should add that it seems to me that that earlier Roman Calendar only had
10 months. I prefer our Julian Calendar (with its Gregorian
ian Roman
> calendar onto a modern calendar. I think it would have to be arbitrarily
> reset somehow rather than fast forwarded.
>
>
>
> Jack Aubert
>
>
>
> *From:* sundial *On Behalf Of *Michael
> Ossipoff
> *Sent:* Saturday, September 17, 2022 9:02 PM
> *To
Well, sundials often have solar-declination lines, & the old sundials (&
the best modern ones too) often use those declination-lines to demarcate
the ecliptic-months (the astrologers’ tropical-signs, from Aries to
Pisces), labeled with the old symbols for them.
.
So that subject is certainly not
.
The first thing I want to emphasize is that calendar-reform is not going to
happen. What to do? Just deal with the calendar that we have…the one that
we’ve had for two millennia.(…but with its Gregorian-modernized
leapyear-system). Don’t waste your time on calendar-reform, because, for
one
As others have pointed out, you don’t need the logarithms. Tables of
logarithms, trig-functions, & logs of trig-functions aren’t needed now that
we have scientific-calculators, computers, spreadsheets, etc. Just use the
trig-functions directly, as the others have said.
.
You made a good choice
On Tue, Jun 7, 2022 at 11:15 AM Dan-George Uza
wrote:
> Hello,
>
> Are there sundials showing the Sun's right ascension? Can you please post
> a photo? Thanks!
>
> Dan Uza
> ---
> https://lists.uni-koeln.de/mailman/listinfo/sundial
>
> You could
be of
practical interest, & the former of interest too.
Michael Ossipoff
On Tue, Mar 15, 2022 at 5:51 PM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:
>
> It seems the USA may be getting ready to abolish seasonal clock
> changes. The proposal has just passed i
the meridional-plane..."
On Sun, Apr 4, 2021 at 6:53 PM Michael Ossipoff
wrote:
> I agree about Analemmataic Dials not being educational, except for
> students who are interested in the trig and willing to listen to, study and
> work on the subject. Some are, and for them it would be g
On Sun, Apr 4, 2021 at 6:57 PM Michael Ossipoff
wrote:
> ...and the Horizontal-Dial, if not in shade, tells time whenever the Sun
> is up, and is readable from every direction, if the person is sufficiently
> close to it....and, in general, the Flat-Dials are the easiest-buil
...and the Horizontal-Dial, if not in shade, tells time whenever the Sun is
up, and is readable from every direction, if the person is sufficiently
close to it....and, in general, the Flat-Dials are the easiest-built
dials.
On Sat, Apr 3, 2021 at 11:34 PM Peter Mayer
wrote:
> Hi Rudolph,
>
I agree about Analemmataic Dials not being educational, except for
students who are interested in the trig and willing to listen to, study and
work on the subject. Some are, and for them it would be great.
But for most people, it's just a magic-trick, as you pointed out. The
Analemmatic has the
Sorry, but the mapping of the Earth in two circular pieces goes back at
least to the 1500s or 1400s.
.
The difference is that the 1400s & 1500s maps showed two side-by-side
circles, making it much easier to use, rather than having it on opposite
sides of a disk.
.
The favorite ancient way to map
when it's at its shortest, at
which time it's to the north of the sub-tip point.
Michael Ossipoff
On Sat, Aug 8, 2020 at 12:59 PM André Reekmqns
wrote:
> Looking for the 3 pages article published in BSS or NASS 10 years? about
> rectifying a misaligned pole-style horizontal or vertical s
ed the "correct" time at 05:58, so with a few more
> decimals it would be within a minute of the Stellarium and YourSky programs
> (which rigorously uses Meeus, I believe).
>
> I am leaning to a 06:00 as the consensus.
>
> Ross
>
>
> --
>
ppear better than he was. The day of birth was a public
> announcement; the time was apparently a closely guarded secret, since
> astrology could be a political weapon.
>
> Ross
> --
> *De :* Michael Ossipoff
> *Envoyé :* lundi 29 juin 2020 18:39
> *
the Sun appeared over the trees, mountains or buildings, or
by calculating Sunrise-time based on a 14th century estimate of Milan's
longiitude? And were they minutes of equal-hours time, or of
temporary-hours time?
.
Michael Ossipoff
On Mon, Jun 29, 2020 at 5:23 AM Ross Sinclair Caldwell
wrote
include it.
Of course, with both Babylonian and co-Italian Hours, one could determine
Temporary hours by:
T = B/(B+CI)
...where T = Temporary
B = Babylonian
CI = co-Italian
Michael Ossipoff
Aprilis 23rd, 2020
Taurus 5th
18 Th
On Wed, Apr 22, 2020 at 3:00 PM Steve
if, as you said, it isn't even a
2000-year-old dial, and is only from the Roman era. What a disappointment.
But thanks for pointing it out anyway.
.
Michael Ossipoff
Aprilis 10th, 2020
Aries 22nd
16 F
.
On Fri, Apr 10, 2020 at 2:27 AM Karlheinz Schaldach <
karlheinz_schald...@t-online.de> wrote
aspirated "k", as
in "Loch" or "Achtung". ...and its name "chi", is pronounced in English
with that consonant-sound, though we often hear it said as just a "k".
I didn't notice the "T" in the word on the Summer-Solstice line.
It looked. to me
y that would be a
particularly difficult surface to carve accurately, but that's what they
say.
The Hemicycleum is my favorite stationary dial, and it's the next one that
I'll make (but it will be cardboard & paper, or sheet-plastic, and the
dial-surface will be cylindrical.
Michael Ossipoff
April
is about twice the size of the tiny-aperture
image.
.
Michael Ossipoff
Aprilis 8th, 2020
Aries 20th
16 W
.
On Wed, Apr 8, 2020 at 12:05 PM Dan-George Uza
wrote:
> Hello,
>
> I'm a big fan of meridian lines inside churches and I know these are sort
> of camera obscura sundials.
On Tue, Apr 7, 2020 at 12:24 PM Michael Ossipoff
wrote:
> ...and of course the surrounding flat-dials could, instead, be
> Reclining-Declining Dials facing in the cardinal-directions.
>
> But the sphere-segment indentation surface gives a better continuous
> system of dial-lines.
If the indentation were a shallow rectangular hollow instead of a segment
of a sphere, it would of course amount to several adjoined flat dials--a
horizontal-dial surrounded by vertical-dials.
Michael Ossipoff
16 Tu
Aries 19th
Aprilis 7th
On Tue, Apr 7, 2020 at 7:07 AM Peter Mayer wrote:
>
to stereographic lines, by having a projection-point not at
the center of the sphere.
It sounds like a great idea for a birdbath or bowl, but it might be too
distracting for a skateboard-park.
.
Michael Ossipoff
Aprilis 7th, 2020
16 Tu
Aries 19th
On Tue, Apr 7, 2020 at 7:07 AM Peter Mayer wrote:
>
Now the Solar declination is more than halfway from its Yul
(Winter-Solstice) value to its Ostara (Spring-Equinox) value.
And, in mid-latitudes (mid-lat U.S., and similar latitudes in Europe), the
daily insolation (ground-warming sunlight received by the ground) has
likewise passed the halfway
Dan--
Evidently those two sources you named got their result from the same other
source, which had made an error....or else one of those two sources got
their result from the other.
If the two years are separated by a leapyear (but 1930 and 1931 aren't),
then there could be a 3-day
Yesterday the Solar-declination reached and passed the point 1/3 of the
way, back up from the Winter-Solstice, toward the Celestial-Equator.
7 Th (South-Solstice WeekDate Calendar)
Aquarius 19th (South-Solstice Ecliptic-Months Calendar)
Februarius 7th (Roman-Gregorian Calendar)
Michael Ossipoff
I'd just like to say a few more things about the portable folded-paper
flat-dials. What interests me about them is that I like the Regiomontanus,
as my favorite portable dial, and the most easily-built sundial of any
category. But it's of interest how easily-built can be a portable-dial that
ild the Cylindrical-Equatorial.
.
49 M
November 25th
2328 UTC
.
Michael Ossipoff
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I should add that the Folded-Paper Horizontal & Vertical-Polar Dial can
also be made with just one fold:
.
A 2:1 paper rectanble is folded at its middle in a right-angle.
.
The fold is held by a thread connecting the middles of the top-edges of the
two squares.
.
A nodus (bead or
squares.)
.
48 Su
November 24th
2142 UTC
.
Michael Ossipoff
---
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I wrote:
Hi Franco--
>
Sorry to mis-write your name--I meant Francesco.
48 W
November 20th
1649 UTC
Michael Ossipoff
On Wed, Nov 20, 2019 at 11:29 AM Michael Ossipoff
wrote:
> My dials will show 9 declination-lines:
>
> 1; Equinoxes, solstices, and half-solstice declin
; using a string-mounted nodus-bead instead of a stick-gnomon (which
I consider to be an eye-injury-hazard); and not being cut-away as the
Hemicyclea usually were.
48 M
November 20th
1628 UTC
Michael Ossipoff
On Wed, Nov 20, 2019 at 11:00 AM Michael Ossipoff
wrote:
> Hi Franco--
> .
&g
a drawing can show.
48 W
November 20th
1600 UTC
.
Michael Ossipoff
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I said it backwards. For positive declination, use NEO. For negative
declination, use 180 - NEO.
48 Tu
November 19th
2103
Michael Ossipoff
---
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I should mention that, when posting about the trig-at-the-dial method, I
assumed a positive declination. When the declination is negative, you just
use NEO instead of its supplement.
48 Tu
November 19th
1534 UTC
---
beer 19th
1524 UTC
Michael Ossipoff
---
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In the date at the bottom of my post, I mistakenly said "48 M, November
18th", but the correct Greenwich date of course was and is:
48 Tu
November 19th
Michael Ossipoff
On Mon, Nov 18, 2019 at 7:42 PM Michael Ossipoff
wrote:
> First, an omission in my post about the tri
math-topic you introduce someone to, and I
emphasize the matter how useful it will be in other sundial topics.
I don't mean any criticism of other construction-explanation. Of course
there can be any of various considerations, suggesting any of the various
methods.
.
48 M
November 18th
0037 UTC
or azimuth calculations, than for other
trig problems or other 3-dimensional analytic-geometry problems.
.
47 Su
November 17th
2140 UTC
.
Michael Ossipoff
---
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and straighforwardly
derived by applying the definitions of the trig functions to an orrery.
...for a brief and straightforward derivation that would make sense to
anyone with no prior experience in the subject.
On Sun, Nov 17, 2019 at 1:42 PM Michael Ossipoff
wrote:
> I mean, when you
use for
various other matters, for sundials and all sorts of things.
.
.
47 Su
November 17th
1830 UTC
.
Michael Ossipoff
---
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Hi Frank--
Thanks for the thorough and complete explanation about conic-sections for
declination-lines for flat-dials.
Yes, but I want to be able to explain the actual numerical calculation of
the declination-lines to someone. ...to explain the derivation of the
actual formulas for the
ways of drawing them.
>
> Simon
>
>
> On Fri, Nov 15, 2019, 07:49 Michael Ossipoff wrote:
>
>>
>> Is there an easy explanation/derivation for the solar-declination lines
>> on a Horizontal-Dial? I mean, easiness comparable to that of the
>> declination
be explained to
them, preferably without their having to listen to an long explanation.
.
Week 47, Friday
November 15th
1450 UTC
.
Michael Ossipoff
---
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...and it seems to me that the South-Solstice of 2017 occurred on December
21.686, where the time of day is expressed as a fraction of a day, appended
to the date.
Michael Ossipoff
41 F
On Fri, Oct 4, 2019 at 7:15 PM Michael Ossipoff
wrote:
> Autumn doesn't begin at the autumnal equi
I like the pond suggestion, It hadn't occurred to me, and I hadn't heard it
before.
Michael Ossipoff
40 F
September 27th
1101 UTC
---
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-declining dial's
hour-line construction can be derived and explained without spherical trig
or spherical co-oridinate transformations. (...though declination-lines
for it would still require them).
Michael Ossipoff
Week 40, Friday
September 27th
1050 UTC
On Thu, Sep 26, 2019 at 4:00 AM Dan-George
Patrick--
That isn't necesary, because sundials are for telling solar time, not clock
time.
If you want Standard-Time, then a conversion table, incorporating EqT &
longitude-adjustment, can be used.
Michael Osslipoff
July 31st
Week 32, Wednesday
0540 UTC
On Tue, Jul 30, 2019 at 3:17 PM
e days now, and so it's obvious enough
that it's week 20 today. And it's obviously Friday.
...but even as easy as WeekDate is, I managed to get today's
day-of-the-week wrong.
Michael Ossipoff
20 F
On Fri, May 10, 2019 at 10:14 AM Michael Ossipoff
wrote:
>
> Regarding Cone Aperture-Dials:
a windosill sundial whose construction I
couldn't explain to my girlfriend,
Michael Ossipoff
20 Th (May 10th)
1414 UTC
On Tue, May 7, 2019 at 1:57 PM Gian Casalegno
wrote:
> Dear friends,
> a new issue of the Italian magazine Orologi Solari is available for
> download from the usual
word-usage of yours. I
was just objecting to the word-usage in the text that you were quoting (a
usage that has justification that I didn’t know about).
-
Michael Ossipoff
20 M
1546 UTC
---
https
ours", because their length varies
seasonally.
One way to get temporary-hours is from Babylonian and co-Italian hours.
Divide the Babylonian hour from the sum of the Babylonian hour and the
co-Italian hour.
Michael Ossipoff
19 Th
(Thursday of the 19th week of the calendar-year that starte
with is wide
coverage of dials and dialists worldwide, and his own
artistically-aesthetic dials.
Michael Ossipoff
14 W
0200 UTC
On Wed, Mar 27, 2019 at 6:14 AM lvadillo wrote:
> I'm deeply impacted by the sudden death of our friend Reinhold. Met him 10
> years ago and since then we kept
>
> On 23 Mar 2019, at 15:51, Michael Ossipoff wrote:
>
> >
> > The International Standards Organization WeekDate calendar (ISO
> > WeekDate
> > Calendar):
> >
> > .
> >
> > The calendar year starts with the Monday closest to Gregorian
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