Math and the heavens

OK, that's a grandiose title. It seemed appropriate to save in one directory those more-or-less mathematical posts related to calendars and astronomy. Besides the specific question of locating the sun in the sky, we have just a few topics here:

• Background information on calendar traditions and a discussion of the mathematical aspects of the calendar. For your convenience, here's a pointer to the Calendar FAQ offsite.
• Related is the question, on which day of the week does a date fall?
• When's Easter this year? (I think it's a Sunday...)
• Sources of astronomical data
• Pointer to ephemeris

• My home page is just a short introduction to the pages I maintain
• The parent page to this one is another short way-station, this time to a few pages concerning "applications" of mathematics (well, let's call them "investigations only a mathematician would love").
• I keep a large set of pages which provide a thematic introduction to the subject areas of modern mathematics, complete with answers to thousands of more or less common questions.

This page is

	http://www.math.niu.edu/~rusin/uses-math/astro/index.html