Surf these sites: Astronomical Time Keeping -- Extensive descriptions of many astronomical time keeping systems, with information on time zones and Julian day numbers. Blue Moon Myths -- Second full moon in a month, or third full moon in a single season? Calendar Conversions -- A handy tool for converting to and from various calendars, including the Jewish calendar and the French Republican calendar. Islamic Calendar -- Islamic months begin at sunset on the day of visual sighting of the lunar crescent. This site discusses the concept of the International Lunar Date Line and contains numerous maps of crescent visibility. Leap Seconds -- Civil time is occasionally adjusted by one second increments called leap seconds. A detailed explanation of what a second actually is, and why leap seconds are necessary. Lunisolar Calendar -- Calendar with lunations, from new moon to new moon, instead of months. Moon phase on each day. Chinese, Jewish, and Islamic months. Eclipses, meteors, planets, star charts. Christian, Pagan, Islamic, Hindu, and Jewish holidays. The Calendar, Leap Years and the Year 2000 -- An explanation of the calendar including the origin of the day, week, month and year. The Correct Time and Moon Phase -- Shows the current phase of the moon and gives the correct time from the atomic clock at the United States Naval Observatory. Time and Date -- Lots of time and date related information, such as yearly and monthly calendars, counters, countdown, and the world clock which shows the current time in cities all over the world. Time and Dates -- Information on date, time, and time zones from the New York Public Library.
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