For most years, the length of the Moon synodic month (New Moon to New Moon) is 29.5 days.
The Moon orbits the Earth once every 27.32 days
An eclipse of the Sun can occur only at New Moon, and an eclipse of the Moon can occur only at Full Moon.
2007 Phases of the Moon
Universal Time (GMT)
NEW MOON FIRST QUARTER FULL MOON LAST QUARTER
D H M D H M D H M D H M
JAN 3 13 57 JAN 11 12 45
JAN 19 4 01 JAN 25 23 01 FEB 2 5 45 FEB 10 9 51
FEB 17 16 14 FEB 24 7 56 MAR 3 23 17 MAR 12 3 54
MAR 19 2 43 MAR 25 18 16 APR 2 17 15 APR 10 18 04
APR 17 11 36 APR 24 6 35 MAY 2 10 09 MAY 10 4 27
MAY 16 19 27 MAY 23 21 02 JUN 1 1 04 JUN 8 11 43
JUN 15 3 13 JUN 22 13 15 JUN 30 13 49 JUL 7 16 54
JUL 14 12 04 JUL 22 6 29 JUL 30 0 48 AUG 5 21 20
AUG 12 23 02 AUG 20 23 54 AUG 28 10 35 SEP 4 2 32
SEP 11 12 44 SEP 19 16 48 SEP 26 19 45 OCT 3 10 06
OCT 11 5 01 OCT 19 8 33 OCT 26 4 52 NOV 1 21 18
NOV 9 23 03 NOV 17 22 33 NOV 24 14 30 DEC 1 12 44
DEC 9 17 40 DEC 17 10 17 DEC 24 1 16 DEC 31 7 51
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Waxing Crescent -- the visible Moon is partly but less than one-half illuminated by direct sunlight while the illuminated part is increasing.
First Quarter -- one-half of the Moon appears illuminated by direct sunlight while the illuminated part is increasing.
Waxing Gibbous -- the Moon is more than one-half but not fully illuminated by direct sunlight while the illuminated part is increasing.
Full Moon -- the visible Moon is fully illuminated by direct sunlight.
Waning Gibbous -- the Moon is less than fully but more than one-half illuminated by direct sunlight while the illuminated part is decreasing.
Last Quarter -- one-half of the Moon appears illuminated by direct sunlight while the illuminated part is decreasing.
Waning Crescent -- the Moon is partly but less than one-half illuminated by direct sunlight while the illuminated part is decreasing. NOTE: Following Waning Crescent is a New Moon, beginning a repetition of the complete phase cycle of 29.5 days average duration.
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