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The Urban Astronomer

April Mornings above Golden Gate Park

18 Apr 2009, 14:19 UTC
April Mornings above Golden Gate Park
(200 words excerpt, click title or image to see full post)

The next few mornings promise rewarding sights if you are up before sunrise. For me, this is the view when I go out to get the morning newspaper. I have a good south-eastern view and I find the waning Moon to be an engaging beacon above the trees of Golden Gate Park. As the Moon rises later each day, it sweeps past three planets now visible in the morning sky, Jupiter, Venus and Mars, and it appears lower and lower each day until it is lost in the glare of the Sun at the end of next week. The illustrations show how much the Moon moves from one day to the next -- a little over 12 degrees. Why is that? You just need some simple division to get the answer yourself: The Moon travels 360 degrees in each orbit around the Earth, and it takes 29 1/2 days to circle the Earth once (from our Earth-bound perspective)

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