RocketMan

[Electron.John]

Sally was chatting on an internet with a man that went by the name "RocketMan". He claimed to have been an astronaut for NASA in the early 1970's and to have walked on the Moon. "I remember watching the Earth set behind the Apennines, that is a large lunar mountain range, and it was more beautiful than any sunset I have every seen on earth." RocketMan told Sally. He also told her that only six of the Apollo missions landed on the Moon (Apollo 11, 12, 14, 15, 16, and 17). Sally took all of this in and then told him "Your stories are all very interesting but I do not believe for a minute that you were ever on the Moon!"
What reason does Sally have to doubt that RocketMan was on the Moon?

[Angelgurl]

the Apennines is a mountain range in Italy

[Electron.John]

And on the moon. So no that was not why Sally said that.

[Angelgurl]

are the Apennines on the dark side of the moon?

[Electron.John]

No. But you are getting closer to the answer (which has nothing to do with the Apennines by the way).

[Electron.John]

The answer is.......





The can't watch the Earth set on the moon like you can watch the sun set on Earth. It takes many days for the Earth to set on the moon, just like it takes many days for us to watch the moon go from a full moon to a new moon. From the surface of the moon the Earth will just look like it is stuck in the same point in the sky, so the RocketMan could not have watched the Earth set behind the Apennines.

[BiocideJ]

Actually the moon is in synchronous rotation with the earth so the earth would NEVER set from the perspective of the moon.

Great riddle though. I wish i had seen it before you posted the answer.

[Electron.John]

BiocideJ, you are right about the moon being in a synchronous rotation with the Earth and it so the Earth does mostly remain stationary in the moon sky. But the Earth does not remain perfectly stationary. There will be locations where the Earth will slowly rise and set during the lunar month as seen from the surface of the moon.

http://starchild.gsfc.nasa.gov/docs/StarChild/questions/question58.html

[BiocideJ]

BiocideJ, you are right about the moon being in a synchronous rotation with the Earth and it so the Earth does mostly remain stationary in the moon sky. But the Earth does not remain perfectly stationary. There will be locations where the Earth will slowly rise and set during the lunar month as seen from the surface of the moon.

http://starchild.gsfc.nasa.gov/docs/...uestion58.html

Fascinating. So the earth moves based on the tilt of the moon as it revolves. Makes sense once i read it. Thanks.

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