There is this moon question that has been bugging me for years and I want to finally put it to rest. Those of you who have traveled to tropical latitudes may have noticed that the moon often appears differently than in does in the United States. The phases are the same, but different sides appear to be shaded differently depending upon where on the Earth you are looking at it. I've told folks this and they pretty much told me I was crazy, but here's what an astronomy professor at Warren Wilson College, Don Collins, had to say about this question:
"The phases of the moon should appear the same from any point on the earth, i. e. first quarter will appear to be a half-moon shape from anyplace on the earth.
"What may be deceptive, however, is that the position of the moon is different - especially from the tropics. For example, at this time of year, the quarter phase early in the evening is quite high in the sky from the Carolinas, but still south of the zenith. When viewed from the tropics in southern India, the moon at this time of year (last night or tonight) will actually be north of zenith. When viewed from the southern hemisphere the moon will appear "upside-down" compared to our northern hemisphere view. The fraction of the moon illuminated will appear the same to all observers on earth, except for a very small impercepible difference. "
He wrote this email to my father about a month ago, so I'm not sure if it applies right now, in late March. This whole thing has been driving me crazy. What is the moon looking like over there in the US right now? Which part is illuminated? This is what the moon looked like from my roof last night at about 8pm.
Could someone in the U.S. please take a digital picture of the moon and send it to me? Especially someone in the Northeast, that would be especially helpful. I need to compare these photos!
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1 comment:
Melanie,
Very interesting question regarding the phases of the moon as seen from Madurai. I will get help in getting a digital shot of the moon in our hemisphere.
Phillip
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