#Full moom may full
As the Moon’s orbit is inclined by 5.145° from the ecliptic, it is not generally perfectly opposite from the Sun during full phase, therefore a full moon is in general not perfectly full except on nights with a lunar eclipse as the Moon crosses the ecliptic at opposition from the Sun. For any given location, about half of these maximum full moons may be visible, while the other half occurs during the day, when the full moon is below the horizon. Because a calendar month consists of a whole number of days, a month in a lunar calendar may be either 29 or 30 days long.Ī full moon is often thought of as an event of a full night's duration, although its phase seen from Earth continuously waxes or wanes, and is full only at the instant when waxing ends and waning begins. Therefore, in those lunar calendars in which each month begins on the day of the new moon, the full moon falls on either the 14th or 15th day of the lunar month. The time interval between a full moon and the next repetition of the same phase, a synodic month, averages about 29.53 days. The full moon occurs roughly once a month. This means that the lunar hemisphere facing Earth-the near side-is completely sunlit and appears as an approximately circular disk. This occurs when Earth is located between the Sun and the Moon (when the ecliptic longitudes of the Sun and Moon differ by 180°).
The full moon is the lunar phase when the Moon appears fully illuminated from Earth's perspective. This causes an eclipse season approximately every six months, in which a lunar eclipse can occur at the full moon phase. As the Earth revolves around the Sun, approximate axial parallelism of the Moon's orbital plane ( tilted five degrees to the Earth's orbital plane) results in the revolution of the lunar nodes relative to the Earth.
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