Hello:
I need to write a spreadsheet to find the sun position. I know there
are already many programs that do this. However, I need to write one
myself because:
1. I'll learn as I write
2. It will give the sun position in the format that I need
3. I can tweak the spreadsheet to give the same
I have used this same library, it's really good !
Gian Casalegno
http://digilander.libero.it/orologi.solari
Messaggio originale
Da: johngood...@mac.com
Data: 24/08/2011 20.36
A: sundial@uni-koeln.de
Ogg: Re: sun position
If you're looking for software libraries, I've been happy using
: Wednesday, August 24, 2011 4:29 AM
Subject: sun position
I need to write a spreadsheet to find the sun position. I know there are
already many programs that do this. However, I need to write one myself because:
1. I'll learn as I write
2. It will give the sun position in the format that I need
Hello:
I need to write a spreadsheet to find the sun position. I know there
are already many programs that do this. However, I need to write one
myself because:
1. I'll learn as I write
2. It will give the sun position in the format that I need
3. I can tweak the spreadsheet to give the same
If there is a need for someone on the list to generate a programme for
astronomical positions in higher accuracy, I have already coded in C++,
a complete windows library that computes Galactic (GLat/GLng),
Ecliptical (Elat/ELng), Equatorial (Rta/Dec) and Horizontal (Alt/Azi)
positions of the
If you're looking for software libraries, I've been happy using these:
AA+ is a C++ implementation for the algorithms as presented in the book
Astronomical Algorithms by Jean Meeus.
http://www.naughter.com/aa.html
On Aug 24, 2011, at 9:24 AM, David Patte wrote:
If there is a need for
of
light through the atmosphere.
On 2011-08-23 22:29, Donald Christensen wrote:
I need to write a spreadsheet to find the sun position. I know there are
already many programs that do this. However, I need to write one myself
because:
1. I'll learn as I write
2. It will give the sun position
.
Don Snyder
On 8/23/2011 9:29 PM, Donald Christensen wrote:
I need to write a spreadsheet to find the sun position. I know there
are already many programs that do this. However, I need to write one
myself because:
1. I'll learn as I write
2. It will give the sun position in the format that I
From: sundial-boun...@uni-koeln.de [mailto:sundial-boun...@uni-koeln.de] On
Behalf Of Donald Christensen
Sent: Wednesday, 24 August 2011 12:00
To: sundial@uni-koeln.de
Subject: sun position
I need to write a spreadsheet to find the sun position. I know there are
already many
ago said All knowledge
comes up through a pencil Your spreadsheet is the modern pencil, a very shape
pencil, easily broken.
From: Donald Christensen
Sent: Tuesday, August 23, 2011 7:29 PM
To: sundial@uni-koeln.de
Subject: sun position
I need to write a spreadsheet to find the sun position
Colorado
has provided an excellent resource at http://www.nrel.gov/midc/solpos/spa.html,
similar to GROK. Their MIDC Sun Position Algorithm utilizes Jean
Meeus' modified VSOP87 algorithm, reportedly accurate to 0.0003
degrees between years -2000 to +6000. The NREL site also provides
and the setting
of the sun.
Regards, Roger Bailey
From: Bill Gottesman
Sent: Monday, December 20, 2010 8:38 AM
To: Sundial Mailing List
Subject: Wonderful NREL Sun Position Calculator, in time for Solstice fun
Hello Sundial-listers,
I used to rely on Luke Coletti's Great Circle website's
/spa.html,
similar to GROK. Their MIDC Sun Position Algorithm utilizes Jean Meeus'
modified VSOP87 algorithm, reportedly accurate to 0.0003 degrees between
years -2000 to +6000. The NREL site also provides a link to an explanation
of this algorithm as a pdf file http://www.nrel.gov/docs
In order to design a vertical sundial you need to know the
declination of the dial. I plan to use the method outlined
in the Dec 1987 Sky and Telescope Magazine.
In order to do this you need to know the azimuth of the
sun at a particular time. I plan to use the MYSTAR program
for
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