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Various calendar systems have been in use at different times and places around the world.This application deals with only two: the Gregorian calendar, now used universally for civil purposes, and the Julian calendar, its predecessor in the western world.More information on calendars and their histories can be found in E. Richards' "Calendars" chapter of the Explanatory Supplement to The Astronomical Almanac (ed. For more information on the API, please see the documentation page. At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated (position 1 in illustration). At first quarter, the half-lit Moon is highest in the sky at sunset, then sets about six hours later (3).
On average, there's a Blue Moon about every 33 months.The most common names used in North America include: Because the time between two full Moons doesn't quite equal a whole month, approximately every three years there are two full Moons in one calendar month.Over the past few decades, the second full Moon has come to be known as a "blue Moon." The next time two full Moons occur in the same month (as seen from the United States) will be July 2015.Thus, there is a ten-day gap in calendar dates, but no discontinuity in Julian dates or days of the week: 4 October 1582 (Julian) is a Thursday, which begins at JD 2299159.5; and 15 October 1582 (Gregorian) is a Friday, which begins at JD 2299160.5.The omission of ten days of calendar dates was necessitated by the astronomical error built up by the Julian calendar over its many centuries of use, due to its too-frequent leap years.