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Astronomical question and answer 220

 

Frank L. Preuss

 

When does the waxing half-moon set?

 

Midnight.

How can I explain that to myself?

Waxing half-moon is 7 days after new moon. The new moon sets, when the sun sets, in the evening. In 7 days the moon turns for about a quarter of the rotation and that is half a night. And to add half a night to the evening gives midnight.

With new moon the moon is there where the sun is. When the sun goes down in the West, the moon is also there. With waxing half-moon the moon is a quarter of a day behind the sun. When the sun sets, the moon runs 90 degrees behind the sun and therefore stands high up in the sky, when the sun sets, therefore a quarter of a day. With full moon the moon is half a day later than the sun and when the sun sets, the moon rises in the east.

At midnight the sun has wandered a quarter of a day further. It is below us. And the waxing half-moon is then also 90 degrees further and at the horizon in the west.

 

This is the end of "Astronomical question and answer 220"
To the German version of this chapter: Astronomische Frage und Antwort 220

 

 

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