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This cycle provides different populations of antiquity a natural scale of time, months.
Although the modern conception of months 30 and 31 days is over the moon, many cultures and religions still use it.
The lunar month was abandoned for a year does not contain a whole number of lunar cycles.
The mechanism of the change in the appearance of the moon in a month is simply explained.The moon is not a light source. It does reflect the light of the sun on the earth. The moon reflects in fact a small part of the sunlight that reaches it, or about 7%.
The following diagram shows the moon at different positions in its orbit around the earth.
1- New moon | 5- Full Moon |
2- Waxing Crescent Moon | 6- Waxing |
3- First Quarter Moon | 7- Last Quarter Moon |
4- Waxing | 8- waning crescent moon |
Note that the bright side of the moon is always the same side as the sunlight always comes from the same side.
The first lunar phase is new moon. This phase is characterized by a lack of moon in the sky. At this time,
the moon is between the sun and the earth. No light reflected by the moon can not reach an observer because its dark side faces us.
Gradually, the bright side of the moon becomes visible to us it moves around the earth.
A thin crescent is first seen in the evening. But day by day, the crescent thickens and is becoming visible later.
After the full moon, the visible decreases. The last area is visible during the second half of the night when the last crescent is visible only in the morning.
To an observer on the moon, the earth also take different aspects.
The earth also reflects light to the moon. The configurations of the earth and moon are always complementary.
At the new moon, there will be a burial. In a crescent moon, there will be a gibbous Earth.
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