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Space Forum / Astronomy / July 2008Moon in June
I had a great view last night from my park bench (best seat in the solar system) of the Moon sliding slowly under Jupiter. It showed the Moon's true west to east motion, over and above the east to west motion we perceive from the Earth's rotation. It also made apparent the Moon's declination to the ecliptic. Double-A The Moon made another beautiful transit under Jupiter Thursday morning. Jupiter was bright, but the stars of Saggitarius couldn't be seen as the Moon cast a glow on the suburban smoggy haze. The Moon was travelling west to east on its orbit around the Earth, and so it moved west to east past Jupiter. The Earth was also rotating west to east. What direction was Jupiter going, Saul? Double-A It mainly moves EASTWARD, DA! A little bit north or south, but mainly east. Saul Levy >The Moon made another beautiful transit under Jupiter Thursday >morning. Jupiter was bright, but the stars of Saggitarius couldn't be [quoted text clipped - 4 lines] > >Double-A Saul Levy wrote on 18-Jul-08 16:25 : > It mainly moves EASTWARD, DA! A little bit north or south, but mainly > east. [quoted text clipped - 9 lines] >> >> Double-A ~10 arc seconds East to West, from Wed to Fri. D. Ismay wrote on 19-Jul-08 12:33 : > Saul Levy wrote on 18-Jul-08 16:25 : >> It mainly moves EASTWARD, DA! A little bit north or south, but mainly [quoted text clipped - 12 lines] > > ~10 arc seconds East to West, from Wed to Fri. ...make that 'minutes'. Ouch! That's 60 times larger. Still a tiny amount. Saul Levy >D. Ismay wrote on 19-Jul-08 12:33 : >> Saul Levy wrote on 18-Jul-08 16:25 : [quoted text clipped - 15 lines] > >...make that 'minutes'. O.K., that's retrograde motion due to the Earth's motion It's a tiny amount too. Saul Levy >Saul Levy wrote on 18-Jul-08 16:25 : >> It mainly moves EASTWARD, DA! A little bit north or south, but mainly [quoted text clipped - 12 lines] > >~10 arc seconds East to West, from Wed to Fri. |
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