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General Information
- Celestial Body Motion: US Naval Observatory page.
Motion of the Earth
- Revolution: Greenwich Observatory pages on leap seconds
and leap years.
- Rotation: Paul Carlisle's EarthViewer;
Wikipedia page
on solar time.
- Precession: NASA page.
- Seasons, Aphelion/Perihelion: USNO data
page; Windows to the Universe page;
NASA page.
Timekeeping and Navigation
- Time in General: Britannica.com article.
- Timekeeping: Royal Observatory Greewich site;
Ohio State University page.
- Sundials: Sundials
on the internet; NASA page;
North American Sundial Society site.
- Time of the Day: Official US time;
Daylight Saving Time webexhibit;
Time and Date.com.
- Calendars: Bill Hollon's site;
L.E. Doggett's article;
Calendar Zone site;
Web Exhibits site;
M Heydari-Malayeri's article
on the Iranian calendar.
- Days of the Week: InDepthInfo.com page.
- Latitude: Rice University site.
Books
- Alan W. Hirschfeld, Parallax: The Race to Measure the
Cosmos, Freeman.
- K. Mainzer, The Little Book of Time, Copernicus 2002.
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