at 3:28 PM, rodwall1...@gmail.com wrote:
Dialist’s Companion from NASS:
*http://www.sundials.co.uk/nasscomp.htmhttp://www.sundials.co.uk/nasscomp.htm*http://www.sundials.co.uk/nasscomp.htmhttp://www.sundials.co.uk/nasscomp.htm
Roderick.
*From:* Brad Lufkin bradley.luf...@gmail.com
*Sent
Dear John:
attached is the table you've asked for. It includes the astronomical year,
the month, day, and time of the event, and azimuth (in degrees) of sunrise
and sunset. Azimuth is measured from North towards East (so North = 0
degrees, East = 90, South = 180, West = 270).
The table is based on
Dear John:
I may be able to help. I can write a custom program that would generate the
data you are asking for. There is a glitch, however, and that is the
accuracy of the models to be used over such a long period of time. In
particular, I would use the following models:
(a) VSOP87D for the
the spreadsheet attached. At 146
kb, it may not get through the size filter. If so, I will resend the
message and forward the spreadsheet to anyone interested.
Regards,
Roger Bailey
*From:* Brad Lufkin bradley.luf...@gmail.com
*Sent:* Saturday, June 23, 2012 5:58 AM
*To:* John Pickard
The two light sources are the whole point of the movie! So I shan't say
more. BTW, it's a visually stunning piece of work, though a bit bizarre in
other respects.
Brad
On Sun, Dec 18, 2011 at 7:52 PM, Bill Gottesman
billgottes...@comcast.netwrote:
The dial and the trees show two shadows from
for an eclipse)
- Original Message -
*From:* Brad Lufkin bradley.luf...@gmail.com
*To:* Sundial Mailing List sundial@uni-koeln.de
*Sent:* Thursday, December 08, 2011 6:05 PM
*Subject:* Lunar Eclipse of 2011 Dec 10
I thought some of you might be interested in the upcoming lunar
I thought some of you might be interested in the upcoming lunar eclipse on
the 10th of this month. I've attached a diagram showing the regions of
visibility of the eclipse.
Brad
attachment: Lunar Eclipse 2011 Dec 10.png---
for 0.8
seconds.
According to Meuus, the simpler nutation model can be off by 0.5 arcseconds,
which translates into as much as an error of 12 seconds.
More to follow.
Regards, Brad
On Thu, Sep 29, 2011 at 2:24 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
Gian:
Continuing my investigation, I
an abridged form of VSOP87, and this could
explain your discrepancies with Table 27.E.
** **
Roger
** **
On Thu, Sep 29, 2011 at 2:24 PM, Brad Lufkin bradley.luf...@gmail.com
wrote:
Gian:
Continuing my investigation, I tried to reproduce Table 27.E of Meuus's
Astro
Sincere apologies to Mr Meeus, whose last name I've been misspelling. His
book (Astronomical Algorithms) has been a revelation about how to write
about applied mathematical astronomy.
With deepest respect, Brad
On Fri, Sep 30, 2011 at 8:24 AM, Brad Lufkin bradley.luf...@gmail.comwrote:
Roger
(2nd ed., 1995).
** **
Roger
** **
*From:* Brad Lufkin [mailto:bradley.luf...@gmail.com]
*Sent:* Friday, September 30, 2011 8:25 AM
*To:* Roger W. Sinnott
*Cc:* sun.di...@libero.it; Sundial Mailing List
*Subject:* Re: Re: Re: RE: R: Where it wil be equinox, at noon
) degrees.
Brad
On Tue, Sep 27, 2011 at 5:36 AM, Brad Lufkin
bradley.luf...@gmail.comwrote:
Gian:
it's likely that the difference between your result and the result in
Meuus is due to (a) the complexity of the model used and (b) effects
included or ignored (such as aberration, nutation
Gian et al:
I need to take back my last statement: it turns out that VSOP is accurate to
about 10**(-6) degrees.
Brad
On Tue, Sep 27, 2011 at 5:36 AM, Brad Lufkin bradley.luf...@gmail.comwrote:
Gian:
it's likely that the difference between your result and the result in Meuus
is due
...@libero.itsun.di...@libero.it
Cc: Sundial Mailing Listsundial@uni-koeln.de
Ogg: Re: RE: R: Where it wil be equinox, at noon
Gian et al:
I need to take back my last statement: it turns out that VSOP is accurate
to about 10**(-6) degrees.
Brad
On Tue, Sep 27, 2011 at 5:36 AM, Brad Lufkin
My guess is he ends up where he started, i.e., the wise man is telling him,
in the usual pseudo-wise ways of pseudo-wise movies, that he already has the
treasure but just doesn't realize it.
On Tue, Sep 6, 2011 at 2:08 PM, John Carmichael jlcarmich...@comcast.netwrote:
A Riddle:
** **
It must be acknowledged, though, that Mr Hockney's views are not shared by
the majority of art historians. As always, caveat emptor.
Brad
On Fri, Feb 4, 2011 at 1:40 PM, Jackie Jones jac...@waitrose.com wrote:
Dear All,
To read more about the structure of *The Ambassadors*, I can recommend
Meeus's Astronomical Algorithms is not out of print. Check out
http://www.willbell.com/math/mc1.htm. Also, it's cheaper on the publisher's
website ($30 + SH).
Brad
On Thu, Feb 3, 2011 at 5:41 AM, Kevin Karney ke...@karney.com wrote:
Hi Kaarigar
Firstly WELL done. Your web interface is very
I tried to send the following message with a 40K diagram attached but it
bounced, so I'm re-sending it without the diagram. I thought the limit was
50K?
Brad
On Wed, Jan 26, 2011 at 4:54 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
Here's a diagram of an orthographic projection centered
I may have jumped the gun with my last statement. While the orthographic
projection clearly does not apply, several other azimuthal ones show
promise, in particular the Airy, equidistant, and equal-area.
Brad
On Wed, Jan 26, 2011 at 4:59 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
I tried
On Thu, Jan 20, 2011 at 12:29 PM, Brad Lufkin bradley.luf...@gmail.comwrote:
I think having the JDN change at noon UTC avoids a lot of confusion.
Consider this: when is Thursday midnight? Is it the instant between
Wednesday and Thursday or the instant between Thursday and Friday
I suspect there's no relationship. The publishers of the humor magazine were
probably making an oblique reference to the owl of Athena, which is a symbol
of wisdom. A bit sly, but also a bit self-congratulatory (but this is a
college humor magazine, not Dean Swift).
Brad
On Fri, Nov 19, 2010 at
Probably the best book on the invention and impact of mechanical clocks is
Revolution in Time by David S. Landes. Not sure if it's still in print.
Brad
On Fri, Nov 19, 2010 at 5:09 PM, R Wall maill...@virginbroadband.com.auwrote:
Hi Brent,
That reminds be of a book that I read that indicated
The longitude and latitude of the Sun (i.e., the location on the Earth that
the Sun is directly above).
On Wed, Nov 17, 2010 at 8:39 AM, Kevin Karney ke...@karney.com wrote:
This list - together with all the additions - is great !
But, it would be nice to see which of the many items can be
In Corsica (Corse in French), cats eat bouillabaisse. In the old days,
before Corsica was sold to the French, they used to eat pasta.
On Mon, Aug 9, 2010 at 2:23 PM, Fabio fabio.sav...@nonvedolora.it wrote:
Dear John, no problem, there was not offensive words in your email. I'm
only surprise
I've incorporated Google Maps into an Oughtred dial. As you know, the
Oughtred dial can be drawn on any azimuthal map projection (Oughtred himself
chose the Stereographic). Since the dial is drawn on a map, it's possible to
drawn Earth features such as countries as part of the dial. What I've done
Attached is a diagram showing the locations and times of Sunday's solar
eclipse. The solid stripe in the middle of the diagram shows the area of the
globe where the eclipse is total.
Brad
attachment: Solar Eclipse 2010 July 11.png---
Attached is a diagram showing the regions and times of visibility of
tomorrow's eclipse. Looks like the best place to be is in the South Pacific.
Brad
attachment: Lunar Eclipse 2010 June 26.png---
https://lists.uni-koeln.de/mailman/listinfo/sundial
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
Warren:
here's a dial that shows the current position of the Sun. It's an Oughtred
Dial on a gnomonic projection (instead of the stereographic that Oughtred
used). I've also added the current sunset/sunrise terminator and the area of
the globe that is currently illuminated (ignoring refraction,
Just realized I'd neglected to add the SML to the distro.
Brad
-- Forwarded message --
From: Brad Lufkin bradley.luf...@gmail.com
Date: Sun, Apr 4, 2010 at 9:29 AM
Subject: Re: Fwd: how italian hours
To: Warren Thom thom...@gmail.com
Cc: LISTA INGLESE sund...@rrz.uni-koeln.de
Here's what the World looks now.
Brad
On Sat, Mar 20, 2010 at 5:56 AM, Gianni Ferrari gfme...@gmail.com wrote:
Frank,
Congratulation !!!
You wrote:
*The great thing about using sunrise and sunset as reference times is that
governments can't change these times by legislation.*
and
the term a in your formula is the Sun's apparent altitude in degrees (see
Chapter 16 of Meuus's Astronomical Algorithms).
On Tue, Mar 16, 2010 at 12:27 PM, Thomas Steiner finbref.2...@gmail.comwrote:
Hi all,
I am looking for a formula for refraction.
At
It certainly seems to be causing some heart-burn on this list.
On Mon, Mar 15, 2010 at 11:11 AM, John Carmichael
jlcarmich...@comcast.netwrote:
I also heard of a study last year that concluded that DST caused heart
attacks!
-Original Message-
From: sundial-boun...@uni-koeln.de
reprinted by Dover in 1960). Calculating the elements is actually
more
straightforward than using them to get accurate local preditions and curves
for an eclipse.
-- Roger
- Original Message -
From: Brad Lufkin bradley.luf...@gmail.com
To: Sundial Mailing List sundial@uni
Frankly, I think using a 6th order polynomial to approximate data with so
much uncertainty is questionable. I would use linear, piece-wise
interpolation on the tables and the trends outside the range of the tables
(suitably adjusted to match the values at the beginning and end of the
tables).
Brad
(various editions, 1863 to 1891;
also reprinted by Dover in 1960). Calculating the elements is actually
more
straightforward than using them to get accurate local preditions and curves
for an eclipse.
-- Roger
- Original Message -
From: Brad Lufkin bradley.luf...@gmail.com
Just for laffs, here's what I come up with:
Using VSOP87D, with deltaT = 79 seconds, taking into account all known
effects except refraction:
azimuth = 200.72354871227333
altitude = 39.1844374748319
with refraction 39.20512111866974
Using the simpler Sun model in Meuus which only
Can anyone explain (or point me to a resource that explains) what the
ephemeris longitude is and why it's related to the geodetic longitude by
the expression:
ephemeris longitude = 1.002738 (geodetic longitude)
Regards, Brad
---
°16'35.5)
Because ΔT is not known in advance, the value used in the predictions is
an
extrapolation based on pre-2009 measurements. The actual value is expected
to fall within ±0.3 seconds of the estimated ΔT used here.
Patrick
-Original Message-
From: Brad Lufkin bradley.luf
straightforward than using them to get accurate local preditions and curves
for an eclipse.
-- Roger
- Original Message -
From: Brad Lufkin bradley.luf...@gmail.com
To: Sundial Mailing List sundial@uni-koeln.de
Sent: Tuesday, December 22, 2009 3:07 PM
Subject: Re: Nasa website
Speaking
I created diagram of an Oughtred Dial for 1246 AD. The noon line illustrates
the point that Frank King made about the bilateral symmetry of the analemma
in that year. Note also that the longest day of the year (in the northern
hemisphere) was around June 10th and the shortest was around Dec 10th.
---
https://lists.uni-koeln.de/mailman/listinfo/sundial
You have been sent this message from [EMAIL PROTECTED] as a courtesy of
washingtonpost.com
Personal Message:
thought you might enjoy this.
Sundials, Time and Again
By Adrian Higgins
In the garden of Tudor Place, the house museum in Georgetown, an 18th-century
sundial is framed by
43 matches
Mail list logo
