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THE MOON - PowerPoint PPT Presentation


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THE MOON.

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Presentation Transcript
slide3
From any location on the Earth, the Moon appears to be a circular disk which, at any specific time, is illuminated to some degree by direct sunlight. Like the Earth, the Moon is a sphere which is always half illuminated by the Sun, but as the Moon orbits the Earth we get to see more or less of the illuminated half.
slide4
During each lunar orbit (a lunar month), we see the Moon's appearance change from not visibly illuminated through partially illuminated to fully illuminated, then back through partially illuminated to not illuminated again. Although this cycle is a continuous process, there are eight distinct, traditionally recognized stages, called phases.
slide5
The phases designate both the degree to which the Moon is illuminated and the geometric appearance of the illuminated part. These phases of the Moon, in the sequence of their occurrence (starting from New Moon), are listed below.
1 new moon
The Moon's unilluminated side is facing the Earth. The Moon is not visible (except during a solar eclipse).1. New Moon
2 waxing crescent
The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.2. Waxing Crescent
3 first quarter
One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.3. First Quarter
4 waxing gibbous
The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is increasing.4. Waxing Gibbous
5 full moon
The Moon's illuminated side is facing the Earth. The Moon appears to be completely illuminated by direct sunlight5. Full Moon
6 waning gibbous
The Moon appears to be more than one-half but not fully illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.6. Waning Gibbous
7 last quarter
One-half of the Moon appears to be illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.7. Last Quarter
8 waning crescent
The Moon appears to be partly but less than one-half illuminated by direct sunlight. The fraction of the Moon's disk that is illuminated is decreasing.8. Waning Crescent