Jai Bajragbali
The Science behind Indian (Hindu) Calendars The Moon revolves around the earth in about 27.32 days (sidereal month), i.e. if the moon is seen after this interval, it would be near the same star. On every other night one would find the moon near some other group of stars. In Indian system each such star (or group) is called Nakshatra (wives of moon, in all there are 27). Nakshatra (lunar mansion) should be distinguished from Rashis (Zodiacs), which are also groups of stars but are twelve in number and basically represent twelve months of the year (solar). Naksatras may be a part of the 12 zodiacs, or may be a constellation by themselves. The average time interval between two full moons (synodic or lunar month) is about 29.53 days (29 days, 12 hours, and 44 minutes). It is longer than sidereal month because the earth moving at a speed of about 1 degree per day (360 degrees in a year) around the sun would have moved about 30 degrees ahead during this period and moon with its sp...
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