History and FAQ's of calendars, from ancient Rome to outer space. Including Julian, Gregorian, Jewish, Islamic, Chinese, and Mayan.

Compute Local Apparent Sidereal Time Sidereal time is the hour angle of the vernal equinox, the ascending node of the ecliptic on the celestial equator. The daily motion of this point provides a measure of the rotation of the Earth with respect to the stars, rather than the Sun. Local mean sidereal time is computed from the current Greenwich Mean Sideral Time plus an input offset in longitude ...

Articles on the Gregorian and Julian calendars, the ISO date format, the Julian day number system, the Maya calendar, the Goddess lunar calendar, the Liberalia Triday Calendar and C functions for date conversion; plus software for calendrical conversion.

LEAP SECONDS Civil time is occasionally adjusted by one second increments to ensure that the difference between a uniform time scale defined by atomic clocks does not differ from the Earth's rotational time by more than 0.9 seconds. Coordinated Universal Time (UTC), an atomic time, is the basis for civil time. Historically, the second was defined in terms of the rotation of the Earth as 1/86, 400 ...

Explains the mathematical rules for the Chinese calendar.

Location: Home page Counters Why the 3rd Millennium starts in 2001 Go to: Home Page Time Zones World Clock Calendar The difference between the Millennium and year 2000 Short explanation The 3rd Millennium starts January 1st, year 2001 NOT year 2000 as many people believe, when using the Gregorian calendar. Year 2000 starts January 1st, year 2000. Longer explanation The reason why the 3rd ...

This page can be used to generate a Gregorian Calendar for every desired year. The calendar includes also moon phase, Julian days, Local Sidereal Time, Sun rise and set, Moon rise and set and moon Right Ascension and Declination.

This page list many American Indian tribe's names for ...

Provides a slide rule moon phase calendar and other methods of computing astronomical information ...

Celestial Times: a monthly guide to the Night Sky - the Moon and Planets, meteors, comets, eclipses and unusual phenomena.

Astronomical Time Keeping Introduction Siderial Time Solar Time Universal Time (UT), Greenwich Time Timezones Atomic Time Ephemeris Time, Dynamical Time Scales (TDT, TDB) Julian Day Numbers Astronomical Calendars References Introduction: Time keeping and construction of calendars are among the oldest branches of astronomy. Up until very recently, no earth-bound method of time keeping could match ...

Astronomy by JavaScript: Sun Calulators, Solar Data and More ...

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The mathematics of the Islamic calendar in Singapore.

Latest Astronomy news, celestial events calender, astronomy books ...

By Brian Casey, using Skycalendar by by John Thorstensen.

Download pdf version of perpetual Annus Novus Calendar Download latest version of Easy Date Converter software This easy-to-use application - developed by the Acting Minister of Communications The Right Honourable Peter Meyer - converts Gregorian years and dates into their Annus Novus equivalents with a single mouseclick! Annus Novus Decimal Calendar Conscious of the potentially negative impact ...

ObionCounty.com's Time & Moon Phase Page. The Correct Time From The Atomic Clock At The United States Naval Observatory The clock runs for 30 seconds. It may skip seconds during loading. Click reload to restart. Return To ObionCounty.com Front Page Return To ObionCounty.com News Page ...

provides sun and moon tables for given dates.