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Our online tools will provide quick answers to your calculation and conversion needs. On this page, you can calculate moon phase for any given date; present, future or past. This is useful for figuring out dates for new moon/ full moon which marks the beginning of numerous auspicious occasions in many cultures.
In western culture, phases of the lunar cycle are New moon, waxing crescent, first quarter, waxing gibbous, full moon, waning gibbous, last quarter and the waning crescent, in sequential order. The difference in days between two adjacent phases viz., new moon to first quarter, first quarter to full moon, full moon to last quarter and last quarter to new moon is roughly a week's time.
The formula : See this Wikipedia entry for more information on lunar cycle and calculation of moon phase.
* Moon phase shown here is only an approximation and maybe incorrect by a few hours upto a day. For accurate date, refer this NASA catalogue on moon phases.