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The moon has eight phases.
The right half of the moon is illuminated.
The "waning gibbous" phase lasts from 2 days after the full to 6 days after the full.
Phase of the Moon on 19 December: waxing crescent with 10% of the Moon's visible disk illuminated. New Moon on 16 December 2009 at 4:03 a.m. Pacific Standard Time.
The full lunar cycle is roughly 4 weeks, and from full-moon to new-moon is half the cycle, so it would take (roughly) 2 weeks to go from full to new moon.
3/4 of the moon
If tonight the phase of the moon is full when it rises what will be the phase 4 days from now is in the waning gibbous stage.
The moon has eight phases.
a 2nd quarter moon is a phase of the moon and the moon goes through 4 phases.
The right half of the moon is illuminated.
It was a waxing gibbous, but right after a First-quarter moon.
It rises on June 4
The "waning gibbous" phase lasts from 2 days after the full to 6 days after the full.
Phase of the Moon on 19 December: waxing crescent with 10% of the Moon's visible disk illuminated. New Moon on 16 December 2009 at 4:03 a.m. Pacific Standard Time.
Today, January 1, 2011, the Moon is in the "waning crescent" phase with about 6% of the visible face of the Moon illuminated. There will be a partial solar eclipse on January 4, which can only occur at the precisely "new" moon.
"First Quarter" is the phase when the moon appears half-illuminated, and rises and sets roughly 6 hours (1/4 day) after the sun.
Sunrise, Sunset, Moonrise, Moonset, and Moon Phase.