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3 votes

Error when calculating Alt/Az from Ra/Dec

I have the answer to your question, in case you have not already worked it out! You have used the wrong value for the Longitude of the Sun in your calculation of GMST0. You used the Ecliptic Longitude,...
John H's user avatar
  • 46
2 votes

Why does the sun rise north of east between the vernal and autumnal equinox?

[For this explanation, it's helpful to ignore the slight apparent $1^\circ$ motion of the Sun throughout the day]. The way I like to think about this is imagine standing at the North Pole in the ...
Greg Miller's user avatar
  • 5,922
1 vote

How does moonrise/moonset azimuth vary with time?

The azimuth of moonrise and moonset can be determined from the observer’s latitude and the Moon’s declination. The azimuth of a celestial body can be given by $$ \cos A = \frac{{\sin \delta - \sin \...
JeffC's user avatar
  • 21

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