Moon phase today: Waning Gibbous
Next full moon in 23 days. Next new moon in 9 days (reference date: Dec 21 2024).
Moon phase calculation
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.