>
> 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
.
.
Michael Ossipoff
.
13 Sa (South-Solstice WeekDate Calendar)
1551 UTC
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
when reckoning Easter.
Michael Ossipoff
On Wed, Mar 20, 2019 at 12:00 AM Roger wrote:
> I always thought Easter Sunday was on the first Sunday after the first
> full moon after the spring equinox. This year at my location, time zone
> PDST, the equinox is at 2:59 pm Wed 20 March 2019.
considerably greater than the ratio of the
Sun's distance to its diameter.
Michael Ossipoff
2019, Week 12, Thursday
1632 UTC
On Wed, Mar 13, 2019 at 6:32 PM Kurt Niel wrote:
> In German language we have:
>
> WOZ Wahre Ortszeit (= LAT, 12:00 = sun is exactly south at the location)
&g
istance to
hole-diameter isn't much less than the ratio of the sun's distance to its
diameter.
Michael Ossipoff
2019, Week 12, Wednesday
1746 UTC
On Wed, Mar 13, 2019 at 8:30 AM Frank King wrote:
> Dear All,
>
> I have a mild distaste for "correction" since
>
art saying "Local Constant".
Usually I don't know what the EqT is, but I know the local constant here,
and so, for a good estimate, from Standard-Time, of Sundial-Time (Local
True Solar Time), I just apply the local constant, adjusted for the mean of
the annual EqT extremes, to get
f the South-Solstice based
on the assumption that a South-Solstice occurs exactly every 365.2422 days,
starting from the actual South-Solstice of Gregorian 2017.
(I suggest the latter, arithmetical, rule.)
Michael Ossipoff
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
I suggest the latter, arithmetical, rule.)
Michael Ossipoff
On Sat, Jan 12, 2019 at 1:28 PM Kevin Karney via sundial <
sundial@uni-koeln.de> wrote:
> Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die
> eigentliche Nachricht steht dadurch in einem Anhang.
>
>
method the most error.)
.
Michael Ossipoff
On Mon, Oct 22, 2018 at 12:20 PM Dan-George Uza
wrote:
> Dear John and others,
>
> Thank you for your insights. Although I haven't been able to track the
> analysis I was looking for eventually I did find something similar. Google
&g
I said, " a reasonable estimate can be gotten by substituting dec for tan
dec."
I meant "...dec in radians".
Michael Ossipoff
On Thu, Oct 25, 2018 at 12:44 PM Michael Ossipoff
wrote:
>
> One more thing about AW:
>
> When dec Sun is positive, especially
ore than 23.44, and, so a
reasonable estimate can be gotten by substituting dec for tan dec.
Michael Ossipoff
Michael Ossipoff
On Thu, Oct 25, 2018 at 12:27 PM Michael Ossipoff
wrote:
>
> Steve—
>
> .
>
> I was surprised to find that, at lat 55, the ordinary watch-method (W), at
&
account, and cos dec is
known or well-estimated.
.
Michael Ossipoff
On Thu, Oct 25, 2018 at 1:19 AM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:
> Michael,
>
>
>
> On 2018-10-24 8:25 p.m., Michael Ossipoff wrote:
>
> A Shephard’s Dial wouldn’t help as a sun-com
Sun is, the more greatly the altitude affects the
difference between h and Az. So, what you said about that was true.
I was just looking more at the error due to substituting h and Az for their
sines, and assuming that the altitude estimate is good.
Michael Ossipoff
On Thu, Oct 25, 2018 a
, and of course that would be
inadvisable if it’s printed on white paper.
.
Sun-compasses for practical purposes have been built based on it.
.
Tomorrow I’ll comment on the max errors of W and AW at lat 55.
.
Michael Ossipoff
On Wed, Oct 24, 2018 at 5:25 PM Steve Lelievre
ick preliminary reply. After
dinner, I’ll reply to the rest of your post, and will report the
Watch-Method’s errors at some times at the summer solstice at lat 55.
By the way, of course AW would be at its best at high latitudes.
Michael Ossipoff
On Wed, Oct 24, 2018 at 5:25 PM Steve Lelievre <
I meant: Multiply h * sec Alt Sun by cos dec
In my example, sec Alt Sun was 1.25, and cos dec is somewhere between 1 and
1 - 1/12 (as it always is).
Michael Ossipoff
On Wed, Oct 24, 2018 at 10:55 AM Michael Ossipoff
wrote:
>
> I mis-stated what the secant is. I said:
>
> '
cos dec, which will
always be somewhere between 1 and 1 - 1/12.
...1 at equinox, and 1 - 1/12 at either solstice.
Michael Ossipoff
On Wed, Oct 24, 2018 at 10:30 AM Michael Ossipoff
wrote:
> Dan--
>
> It's as you said. The Watch Method works best (and is only really any
> good)
Dan--
It's as you said. The Watch Method works best (and is only really any
good) when the Sun is low. So, it's really only any good in winter, or very
late or early in the day.
...and a lot of people do most of their hiking in the summer.
Its accuracy increases with latitude.
But, as Favio po
27;s off enough to cause a 22.5 minute problem, the
non-perpendicularity would be quite noticeable.
Inexpensive Band-Equatorials, such as inexpensive Armillaries,always do
terribly by these construction-standards. Out of round band, uncentered,
non-perpendicular gnomon.
Michael Ossipoff
t it. I offered to explain a derivation, but there's no
reason to if you already have an explanation of the derivation of the
formula that you used..
But what was the solar declination (or the date) when the dial time-reading
and the clock-time had the values t
Steve--
What was the solar declination when the dial's time-reading and the
clock-time had the values that you described?
Of, alternatively, what was the date?
Michael Ossipoff
On Fri, Sep 28, 2018 at 1:25 PM Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:
> Micha
that the
dial be azimuth-rotated so that it tells the time that it should tell, and
so it isn't necessary to solve the problem that we're talking about in
order to azimuth-align the dial.
But that problem could be important if you intend to use a portable
equatorial dial as a sun-compa
Sorry, when I said " making a clock", in my previous post, I meant "making
a sundial".
Michael Ossipoff
On Fri, Aug 31, 2018 at 10:17 PM Michael Ossipoff
wrote:
> Another thing: If your clock is giving time that's an hour ahead ofTrue
> Local Solar Time (French
al an
hour ahead of LTST.
(Unless you're really going all-out, and making a clock that automatically
deals with Eq.T, and reads directly in Standard Time or DST--But, as I
said, why do it???.)
Michael Ossipoff
On Fri, Aug 31, 2018 at 10:09 PM Michael Ossipoff
wrote:
>
> One more t
to having
practical relevance.
Michael Ossipoff
Michael Ossipoff
On Fri, Aug 31, 2018 at 10:21 AM Douglas Bateman via sundial <
sundial@uni-koeln.de> wrote:
> Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die
> eigentliche Nachricht steht dadurch in einem Anhang.
r is better.
3. Being out when it's dark is a lot safer in the morning than in the
evening. Less traffic. Fewer muggers and assaulters on the street.
(Mostly, in the morning, you encounter only people who get up early, not
people who stay up and hang-out late.)
Michael Ossipoff
On Fri, Aug
-- Forwarded message --
From: John Davis via sundial
Date: 2018-08-10 18:16 GMT-04:00
Subject:
To: Michael Ossipoff
Cc: Sundial List
Only on flat planes, not inside scaphes
>
> J.
>
Okay, thanks. I didn't know what a scaphe was. I thought it was just a
Sara and John--
But it's said that the hour-lines for Babylonian, Italian, and co-Italian
hours are straight lines, as they are on all the other dials that I've seen
that have Babylonian &/or Italian hours.
Michael Ossipoff
On Fri, Aug 10, 2018 at 4:37 PM, Schechner, Sara
John--
But isn't it saids that Babylonian and Italian hour-lines are straight
lines?
Michael Ossipoff
2018-08-10 4:50 GMT-04:00 John Davis via sundial :
> Diese Nachricht wurde eingewickelt um DMARC-kompatibel zu sein. Die
> eigentliche Nachricht steht dadurch in einem Anhang.
>
rious latitudes. ...and of course with the string-gnomon
slidable in a vertical slot in the vertical surface.
Michael Ossipoff
On Fri, Aug 10, 2018 at 4:22 AM, Dan-George Uza
wrote:
> Dear all,
>
> I've recently found this piece in a museum near me and I need your help in
> dati
that, when you seek to explain the Analemmatic without the
trig, then, by the time you cover everything relevant to it, without
leaving unanswered questions--then you end up with something much more
complicated and difficult than the trig explanation.
Michael Ossipoff
On Tue, Jul 17, 2018 at 7
t, then I don't
perceive them as likely to be helpful to gradeschool students.
Michael Ossipoff
On Tue, Jul 17, 2018 at 7:31 PM, Roger wrote:
> Hi Jack and Michael,
>
>
>
> I don’t agree. The concept is very simple. Perhaps you have had bad
> teachers. One of my present
e celestial sphere, celestial-co-ordinate systems drawing and the
sine, cosine and tangent definitions, and their application to that
drawing, and the finding of an expression for the Sun's azimuth. ...an
expression that directly translates to the Analemmatic layout.
I strongly agree with m
ines on your Reclining-Declining model to
the actual Reclining-Declining Dial that you want to build.
Michael Ossipoff
On Wed, Jul 18, 2018 at 2:10 PM, Michael Ossipoff
wrote:
> Yes, the central-gnomon Equatorial dials, with their gnomon parallel to
> the Earth's axis, and their ci
a certain time.
That might sound like cheating, but it's a legitimate way that such a dial
could be constructed, and for anyone who doesn't want to hear the 5-day
explanation, it's way that you could remind someone that they could make
such a dial.
Michael Ossipoff
On Tue, Ju
he Analemmatic is available in
various sources, and so there probably isn't reason to take up space here
by posting it, unless there are one or more particular requests for it.
--
Michael Ossipoff
On Tue, Jul 17, 2018 at 12:42 PM, Michael Ossipoff
wrote:
>
> Jack-
quatorials.
Insisting on limiting it to central-gnomon Equatorials sounds unfair to
students motivated to look at other dials.
Michael Ossipoff
On Tue, Jul 17, 2018 at 1:50 PM, Steve Lelievre <
steve.lelievre.can...@gmail.com> wrote:
>
> An analemmatic dial is more considered more
layout.
Let me just send this post now, and then (maybe this morning, probably this
afternoon, but maybe Wednesday morning) start saying something about topic
#1, above.
Michael Ossipoff
On Tue, Jul 17, 2018 at 9:23 AM, Jack Aubert wrote:
> I very much agree with this. In fact, at the ris
ridian, that's the
Sinusoidal Projection. It's useful, but many people feel that it looks
awful. It's that roughly diamond-shaped world map that you might have
seen. Apianus II has a pleasing globe-similar elliptical shape.
Michael Ossipoff
On Thu, Jul 12, 2018 at 8:47 PM, Micha
time at or before 6:00 a.m.,. and at or after 6:00 p.m.
As with the main aperture, the hour lines for those side-apertures would be
marked so that their angular distance along the circumference from the
point opposite the aperture is twice that hour angle's time's difference
from 6 o&#x
I've just realized that I mis-spelled "aperture". I don' t know why I added
the extra "a".
Michael Ossipoff
On Thu, Jul 12, 2018 at 12:26 PM, Michael Ossipoff
wrote:
>
> As Hunt pointed out, there might be many locations where an Anelematic is
> the only
r any ready-made
cylinder, with a hold drilled in it at the top (...and preferably a pair of
auxilliary 6 o'clock aperatures at each 6 o'clock position, with
corresponding speial extra hour-lines opposite them.
Michael Ossipoff
On Wed, Jul 11, 2018 at 5:06 AM, William Irvine <
w
ty of South Carolina, it seems to me.
Right now, the French-Republican Calendar, with 10-day weeks, and 12 months
of 30 days each, is being discussed, in a comparison with a WeekDate
calendar such as ISO WeekDate. In that thread, my own Minimum-Displacement
leapyear-rule is defined.
Michae
ear.
It isn't surprising that evening crime is reduced when the clocks are set
ahead, because it doesn't get dark as clock-early.
Those are good reasons to keep advanced-time (DST, Summer-time) all year.
Michael Ossipoff
On Mon, Mar 19, 2018 at 3:26 AM, Peter Mayer
wrote:
> Hi,
&g
dark is a lot safer than being out in evening dark. That' because evening
dark has more traffic, and more dangerous people out and about.
So, contrary to those safety-based arguments against year-round DST, such a
system would be safer.
Michael Ossipoff
me that the probe is much
smaller than the Sun :D
.
II mentioned the matter here because people here probably aren't
unanimously gung-ho about "anything for science".
Michael Ossipoff
On Fri, Feb 9, 2018 at 12:26 AM, Roger Bailey wrote:
> Hello Michael,
breeze is
rustling the chlorophyll leaves of the green trees. So, with the warm
sunshine warming your face, you say, “Ah yes, let’s intrusively experiment
on the Sun, and dump garbage into it!”
.
Michael Ossipoff
---
https://lists.uni-koeln.de
That's true--A sundial shows things that a clock doesn't show, a direct
showing of nature's day and year.
Michael Ossipoff
On Mon, Jan 15, 2018 at 2:55 AM, Kurt Niel wrote:
> In some practical matter:
> Using sundials you can:
> - directly observe behaviour o
somewhere, regardless of whether there's practical need.
Michael Ossipoff
On Sun, Jan 14, 2018 at 2:26 PM, Willy Leenders
wrote:
>
> When I talk about sundials, I get the question: "What utility can sundials
> have today?"
> In order to be able to give an answer as divers
affic, and therefore less risk of
getting hit by a car. In the morning dark, there are a lot fewer dangerous
people out, as compared to evening dark.
I suggest that every consideration points to leaving clocks on
advanced-time all year.
Michael Ossipoff
On Fri, Dec 22, 2017 at 3:36 PM, Dan-Georg
dea for school
math classes, or for when someone's child is taking such courses.
Michael Ossipoff
On Sun, Nov 5, 2017 at 10:46 AM, Dan-George Uza
wrote:
> Hello,
>
> I am looking for titles of sundial books for children. I particularly
> liked Annos sundial pop-up book by Mi
t I only call a dial Equatorial if it directly measures the Sun's
apparent movement parallel to the equator, on a uniform circular scale that
measures along a line parallel to the equator. ...even if the dial-face
isn't parallel to
during the
a.m. hours, or the number of hours from 6 p.m., during the p.m. hours."
...which could also be said as: " 15 degrees times (6 minus the number of
hours from 12 noon)".
...for the hours from 6 a.m. to 6 p.m.
Michael Ossipoff
On Mon, Oct 23, 2017 at 7:31 PM, Michael Ossipo
Another typo:
When I said:
"And in north declination, the circumference-aperture would be used."
I mean that in *south* declination the circumference-aperature would be
used.
Michael Ossipoff
On Tue, Oct 24, 2017 at 4:33 AM, wrote:
> Thank you for your nice considerations.
>
Typo:
When I said:
"So, in north declination, the south-notch would be used."
...I meant "*north*-notch".
Michael Ossipoff
On Tue, Oct 24, 2017 at 4:33 AM, wrote:
> Thank you for your nice considerations.
>
> I think that some kind of visualization would make t
end of the cylinder resting on the window-sill, of course the
cylinder's inclination above the horizontal is easily adjusted by sliding
the cylinder (or cone) northward or southward ...to incline the cylinder
or cone with its axis parallel to the Earth's axis.
Michael Ossipoff
the direction-estimation, the drinking-cup would
need a way of hanging it in the right orientation, and so it wouldn't be
much like an ordinary drinking-cup. ...and the line-marking would be
complicated by the non-cylindrical shape of the cup.
Michael Ossipoff
On Mon, Oct 16, 2017 at 8:48 A
amount
approximately equal to the local latitude. ...and read the time from the
hour-lines marked inside the cup.
Obviously the circumference-aperature would limit how high you could fill
the cup, when using it for drinking.
Michael Ossipoff
On Thu, Oct 19, 2017 at 2:31 PM, Michael Ossipoff
wrote:
Of course, for the Cylinder Equatorial with circumference aperature, you
could have declination-ilnes, which would be circles around the cylinder's
circumference.
Michael Ossipoff
On Wed, Oct 18, 2017 at 10:23 PM, Brad Thayer
wrote:
> Michael,
>
>
>
> Thank you for
and you'd have a windowsill dial while working on your main project, the
Hemicyclium.
Michael Ossipoff
On Wed, Oct 18, 2017 at 10:23 PM, Brad Thayer
wrote:
> Michael,
>
>
>
> Thank you for the lengthy response.
>
>
>
> This will actually be the fifth
me, and so it's better of ancient
realism.
Besides, with the spike horizontal, its tip-nodus will still have a shadow
that the spike itself doesn't get in the way of at equinox noon.
Michael Ossipoff
f
.
On Thu, Oct 19, 2017 at 11:13 AM, Frank King wrote:
> Dear Brad,
>
> I&
l mounted in a concrete structure resembling a Hemicyclium.
The copper bowl will have a cool ancient look when it weathers.
Michael Ossipoff
>
> *From:* Michael Ossipoff [mailto:email9648...@gmail.com]
> *Sent:* Tuesday, October 17, 2017 8:44 PM
> *To:* Brad Thayer
> *Cc:* sundial l
in the same direct way that a Disk-Equatorial does. ...but their
dial-surface is parallel to the Earth's polar-axis so someone could argue
that they should be called Polar Band or Cylinder dials.
So what are they correctly called?
Michael Ossipoff
..
On Wed, Oct 18, 2017 at 3:29 AM, Nat
orth in the summer,
and from the south in the winter.
Michael Ossipoff
On Mon, Oct 16, 2017 at 8:48 AM, Brad Thayer
wrote:
> I am looking to make a hemicyclium-type sundial (half-hemisphere) in a
> metal working class. What little I can find on them says they are
> inaccurate, without
not only is that easier, but it's also the basis
Standard-Time (when adjusted for Equation-of-Time and for your longitude).
I'd suggest changing your project to a garden-style Horizontal-Dial.
Michael Ossipoff
>
>
>
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
ere do you put the
> markers to make the measurement?
>
Along two mutually-perpendicular edges, measured from a common corner? :^)
Michael Ossipoff
> Brooke
> Clarkehttp://www.PRC68.comhttp://www.end2partygovernment.com/2012Issues.html
>
> Original Message
>
&
sn't parallel to the dial-face.
Michael Ossipoff
On Tue, Jun 6, 2017 at 7:59 PM, Michael Ossipoff
wrote:
> Hi Dan--
>
> I don't claim to have an answer to your question, because (evidently like
> most) I don't know anything about casting resin.
>
> At least one 5-face
x-closure onto the post. It will have dials on its
4 vertical sides.
Michael Ossipoff
On Thu, May 25, 2017 at 1:30 PM, Dan-George Uza
wrote:
> Hello!
>
> I'm looking for advice on how to cast a sundial from epoxy resins,
> specifically a cubical multiple sundial. Any ideas on
were part of my
> presentation.
>
What were some of the alternatives, and some of their relative advantages?
Michael Ossipoff
>
>
> Fred Sawyer
>
>
> On Sun, May 14, 2017 at 4:40 PM, Michael Ossipoff
> wrote:
>
>> When I said that there isn't an obvious way
Of course, because only the four squared-terms are present, the two
binomials have to be chosen so that, when they're both squared, their
resulting middle terms cancel eachother out. (tan lat tan dec + 1) and (tan
lat - tan dec) meet that requirement.
Michael Ossipoff
On Mon, May 15, 2017
ay of setting the bead.
And, in that way, that beat-setting method is naturally arrived at.
So thanks for pointing out that natural approach, making choices than make
more sense than the approach I was considering.
Michael Ossipoff
On Mon, May 15, 2017 at 2:54 PM, Geoff Thurston
wrote:
n
distance.
Michael Ossipoff
On Mon, May 15, 2017 at 11:32 AM, Michael Ossipoff
wrote:
> Thanks for the Regiomontanus slide.
>
> Then the original designer of that dial must have just checked out the
> result of that way of setting the bead, by doing the calculation to find
> o
vel, but that didn't keep them from being accurate.
Michael Ossipoff
On Sun, May 14, 2017 at 5:18 PM, Fred Sawyer wrote:
> Michael,
>
> See the attached slide from my talk. All the various dials work with a
> string of this length. They vary simply in where the suspension point
scales can be used for vertical orientation by
sighting on the horizon, if the horizon is visible.
A small paper tab, sliding on one of the edges, and casting an edge-shadow
on a date-scale, gives a declination-reading that can be used to
azimuth-orient the dial.
Michael Ossipoff
On Sun,
I mentioned, the desired end-to-bead thread-length can be easily
achieved by the obviously and naturally-motivated two-measurement method
that I described above.
Michael Ossipoff
On Sat, May 13, 2017 at 9:23 PM, Michael Ossipoff
wrote:
> When I said that the vertical hour-lines should be drawn
horizontal line, from the right edge to
the point where the vertical line is drawn, is one unit.
Michael Ossipoff
On Sat, May 13, 2017 at 7:03 PM, Michael Ossipoff
wrote:
> Fred--
>
> Thanks for your answer. I'll look for Fuller's article.
>
> One or twice, I verified for mys
l Capuchin dial.
(If a Capuchin dial isn't universal, it loses a big advantage over the
Shepard's dial, or the related Roman Flat altitude dial.)
Michael Ossipoff
On Sat, May 13, 2017 at 3:47 PM, Fred Sawyer wrote:
> Take a look at A.W. Fuller's article Universal
Hi Peter--
Thanks for the reply and info. Yes, I hope that Fred Sawyer will post about
the derivation of the construction of the Capuchin and Universal Capuchin
dials.
Fred, would you paste some of your lecture material, about that, into a
list e-mail here?
Michael Ossipoff
On Wed, May 10
question, but even a difficult explanation can give
me a good hint, regarding the nature of where the construction came from.
So thanks again for the help, the information, the links!
Michael Ossipoff
On Wed, May 10, 2017 at 4:56 PM, Yvon Massé wrote:
> Michael,
>
> Some years ago, I sp
Sure, analytic geometry verifies that the Universal Capuchin dial agrees
with the formula that relates time, altitude, declination and latitude.
But that isn't how medieval astronomers &/or dialists arrived at the
construction of the Capuchin dials.
Michael Ossipoff
On Tue, May 9, 201
figure 2.
Anyway, yes, that's the article to which I was referring. So my question
is, "What would be a genuine explanation and justification for the
construction of the Capuchin and Universal Capuchin dials?
Michael Ossipoff
2017-05-09 15:49 GMT-04:00 Putowsky via sundial :
> Diese Nac
n and explanation of the construction of a Capuchin or
Universal Capuchin dial?
Can anyone here explain that? If so, the explanation would be appreciated.
Michael Ossipoff
[image: Inline image 1]
---
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mple card is what it
will be on the horizontal dial at summer solstice noon.
(unless I've made another error)
Michael Ossipoff
On Wed, Mar 1, 2017 at 10:27 PM, Michael Ossipoff
wrote:
> What am I saying??
>
> You don't need the formula for the sun's brightness at diffe
What am I saying??
You don't need the formula for the sun's brightness at different altitudes.
You just need to tip the color-sample card, from the horizontal, toward the
sun by an amount that's equal to the amount by which the summer-solstice
deciination (23.44 degrees?) will be greater than the
oo bright at solar noon on this week's observing day.
Hopefully there's a shade that is bright enough when the sun is at its
visible lowest at the dial-location, and still isn't too bright at solstice
noon (on a horizontal dial).
I'd bet that some brown or tan would be like
tually, I probably did use the brown
construction-paper. It looks better of course, and it allowed me to
conveniently use a carbon-paper template that I'd prepared for drawing the
hour-lines.
Maybe the plain cardboard dial-face would have easier construction in one
way, and less easy constructi
-post. There would
be a bolt-and-wingnut on the corner-edge opposite the hinge, to tighten the
hinged box onto the lamp-post.
I'd consider declining-dials on the four faces, to that the shadow-casting
edge would intersect the dial-face, on all four faces.
Were pillar-dials usually, often, or ever made that way?
Michael Ossipoff
>
>
---
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re seems to be no purpose for the latitude-marks on the inside of the
vertical, piece--other than to make it look adjustable for latitude.
Michael Ossipoff
On Mon, Feb 20, 2017 at 9:57 AM, Dan-George Uza
wrote:
> Hello!
>
> There's a diptych sundial on sale for about 80 euros su
a matter of directly applying the leapyear-rule, as defined above. .
..and of course, any time when the current year is a leapyear, that fact
will be amply announced long before the end of that year.
Michael Ossipoff
approx. 26N, 80W
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
es.
> Let's let the IAU chart the future of time.
Sure, but it isn't necessary to base a calendar on a day that isn't today's
mean solar day.
Michael Ossipoff
> Dennis and Ken, if you're listening to this discussion, please chime in.
>
>
> On 1/29/201
oosing, for
ourselves, 1) what tropical year we want the calendar's mean-year to
approximate; and 2) what date/season relation we want for the calendar's
center of oscillation.
The Minimum-Displacement leapyear-rule allows the luxury of making our own
choice of those two adjustment-paramete
the
favorite way to make a fixed calendar.
In fact, with Nearest-Monday, the maximum displacement of dates with
respect to seasons, is barely more than the ideal minimum that could be
achieved by the fanciest leapyear system.
I also propose a fancier, deluxely-adjustable system, but I won'
Caution with open office however because I once got malware from the
> official site, not detected by the virus checker I used back then, which
> was a top of the line.
>
> Simon
>
> www illustratingshadows . com
>
>
>
>
> Sent from Yahoo Mail on Android
> <https:
I mean, just using Excel, without using VBA.
Michael Ossipoff
On Sun, Jan 22, 2017 at 11:45 AM, Michael Ossipoff
wrote:
> 1. I don't understand how a spreadsheet's rectangularly-arranged table of
> values is a problem for designing circular things. The values calculated
>
ly:
Is it possible (without purchasing or downloading additional software) to
print out graphics from Excel? ...to calculate, in Excel, co-ordinates of
points along some curve, and then print-out the curve?
...useful for drawing a map, or a sundial, or any of lots of other things.
Michael Ossipoff
dn't it be good
for people to be able to request that the square containing their
front-door have the name of their house, if that word-combination (or
something too close to it) isn't already in use?
Thanks again.
Michael Ossipoff
On Mon, Dec 26, 2016 at 3:15 PM, Ian Maddocks
wrote:
latitude & longitude?
...or, if preferred, some widely-used plane-coordinate system?
Michael Ossipoff
On Sun, Oct 16, 2016 at 1:35 PM, Ian Maddocks
wrote:
> Hi Doug
>
> If you haven't been concentrating I added the W3W address to my signature
> a few months back.
> Given the
that have beenfound.
Equatorial disk sundials supported by the disk and by the end of the gnomon
on the ground are still in use.
Michael Ossipoff
On Thu, Nov 24, 2016 at 4:15 AM, Darek Oczki wrote:
> Dear all
>
> I would like to ask your opinion on the first sundials which inspired
>
ly three more weeks.
>
Of course. If you're going to define 4 seasons, then March is part
of Southern Hemisphere summer. December through March.
But it would make even more sense to speak of March and September as
1-month seasons, as described above.
Michael Ossipoff
--
as big across as the whole cube is.
Michael Ossipoff
On Tue, Jan 5, 2016 at 11:46 PM, Roger Bailey wrote:
> Thanks Fabio and Riccardo,
>
> This is really cool. It makes the design so easy, that it almost feels
> like cheating. Consider the classic painting by Holbein of Kratzer worki
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