Lunar Calander

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ulated time is after midnight but before (or at)
sunrise, then the day of entry is the first day of the new month; otherwise it is the last day of the
previous month. In the Hindu lunisolar system months follow the lunar cycle and are synchronized
with the solar year by introducing occasional leap months. In south-India months begin at new
moon while in north-India months begin at full moon.

Chinese Calendar: Chinese also started using a lunisolar calendar with months beginning on the
day of the new moon. Years contain 12 or 13 such months , with the number of months
determined by the number of new moons between successive winter solstices. There have been
more than 50 calendar reforms since its inception in the 14th century B.C.

Egyptian Calendar: In order to device a solar calendar in ancient times experts observed that
Sirius, brightest of all the fixed stars, appeared in summer, rising above horizon just before sunrise.
They also noticed that Sirius would return to its position after 365 days. Thus, Egyptians deviced
a solar calendar built around 365 days. They gave up their practice of looking for the new moon
in favor of the solar calendar.

Greek Calendar: By 13th century B.C. Greeks were using lunar calendar based on the visible
new crescent. Later they also learnt intercalation to bring lunar calendar in phase with seasons and
started using lunisolar calendar. Astronomers ...