Members of the list have helped in the past to identify stolen dials when they
turned up in auction catalogues. Any sightings of this one would be welcome!
http://www.bbc.co.uk/news/uk-england-hampshire-14617352
Regards
John---
The suns position is specified as altitude and azimuth from the
observers position.
This can be computed from the Declination and Right Ascension of the sun
if you know the current local sidereal time and the latitude.
Then you have to adjust the altitude to compensate for the refraction of
I think a good place to get information is the book by Jean Meeus. The
requisite equations for the sun's azimuth and elevation are given in his
Ch. 13 as eqns. 13.5 and 13.6. His chapters 25 (Solar Coordinates) and
26 (Rectangular Coordinates of the Sun) might also interest you.
Hi Donald,
1. What brand of spreadsheet are you using? Excel? Can you deal with Excel
Visual Basic functions?
2. You will also need to know time zone and whether day-light savings is in
place.
Below are some Visual Basic functions that your will need. My algorithms aren't
precise because I
Hello Donald,
Many of us share your interest in developing the logic to suit our specific
purposes. Many of us have been there and done that. I even have the Sunset tee
shirt that I displayed at a NASS conference way back when.
The starting point is the spherical triangle for your position.
