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Frank L. Preuss

With the answer 196 we had seen that the crescent of the moon turns 360 degrees in 24 hours. Is it now a logical conclusion that because the moon always turns the same side towards the earth, also the moon turns 360 degrees?

That, what turns, is the earth, and with it the observer of the moon. When the moon rises, the man 1 on earth, who stands on zero degree eastern longitude, that degree of longitude, which goes through London, sees the moon from his place. The man 3 on earth, who stands on 180 degrees of eastern longitude, that degree of longitude, which goes through the Fiji Islands, sees the moon from his island. Both see indeed the same moon, but in each case a different view.

The man 1 sees that, what the man 3 saw so about half a day before, and what the man 3 will also see so again half a day later.

The man 2 stands on 90 degrees eastern longitude, that degree of longitude, which goes through Bangladesh.

The man 1 sees the moon from the one side, when it is morning at his place; the man 2 sees the moon from below, at the same time, but with him it is then midday, and the man 3 sees the moon from the other side, also at the same time as 1 and 2, but when it is evening with him.

1 and 2 also see the moon from below, but at an angle from below.

The earth turns around itself and that brings about that the moon apparently turns around the earth, but the moon does not turn, in any case not as the earth turns once around itself in 24 hours.

So the only thing that really moves is the observer, and that with a speed faster than the speed of sound.

This is the end of "Astronomical question and answer 204"
To the German version of this chapter: Astronomische Frage und Antwort 204

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