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Calendars and Timekeeping
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Science:
Astronomy_and_Space:
Calendars and Timekeeping:
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Sundials
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Society: Holidays: Calendars and Lists
Reference: Time
Astronomical Time Keeping
- Features article on the process of determining astronomical time such as sidereal, solar, ephemeris and atomic.
Astronomy Center - The Old Farmer's Almanac
- Provides a skywatch, tide predictions, forums and links.
Cal Sky
- Features the most accomplished astronomical observation and online-calculator of the planet.
Calendar, Leap Years and the Year 2000 AD
- Shows article on the history and types of calendar. Also contains definitions of the day, week, month and year.
Calendarists
- Contains various books regarding calendars published by Cambridge University Press. Features applet from the book Calendrical Calculations: Millennium Edition by Edward Reingold and Nachum Dershowitz.
Earth Orbit
- Information about the solstices, equinoxes, and seasons from Eric Weisstein's Treasure Trove of Astronomy.
Greenwich Mean Time
- Contains data on different time, season and time zones of different continents and countries.
Length of Day and Twilight (Formulas)
- Derives the formulae needed to calculate the length of the day, based on day of year and latitude
Mathematics of the Chinese Calendar
- Features a research paper on the Chinese calendar by Helmer Aslaksen. Shows photos and diagrams.
NASA Eclipse Web Site
- Dates of solar and lunar eclipses.
Newark Museum
- Contains exhibitions, programs and shops. Also shows schedule of some astronomical events.
Paula Burch
- Features article on lunisolar calendar of 2006. Also shows diagram of the calendar.
Physics and Astronomy
- Contains scripts for calculating solar information such as sunrise, sunset, twilight, altitude and azimuth.
Time and Date
- Discusses the difference between the Millennium and year 2000. Also shows charts of staring dates for centuries and millennia.
Time to Talk
- Features article on Blue Moon by Borgna Brunner and Anne Marie Imbornoni. Also contain information on its kinds and calculations as to when it happens.
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