9/23/10 – Ephemeris – Jupiter the planet
Ephemeris for Thursday, September 23rd.* The sun will rise at 7:30. It’ll be up for 12 hours and 7 minutes, setting at 7:38. The moon, at full today, will rise at 7:21 this evening. It’s the Harvest Moon.
Jupiter is the largest planet. It’s volume could contain 1,300 earths. It however is only 318 times the earth’s mass. Still, Jupiter contains the mass of two and a half times all the other planets put together. Jupiter is basically a huge ball of hydrogen. It has a rocky/metallic core several timed the size of the earth. Above that is hot liquid metallic hydrogen to generate Jupiter’s incredibly strong magnetic field. Above that is a deep ocean of liquid hydrogen that gradually becomes the hydrogen atmosphere. What we see of the face of Jupiter are clouds of methane and ammonia. Jupiter doesn’t rotate as a solid body. It rotates faster at the equator than the poles. Astronomers have reduced this to three rotational periods, the shortest is less than 10 hours.
*Times are for the Grand Traverse Area of Northern Michigan, USA.
Bob Moler's Ephemeris Blog 
Strange this post is totaly unrelated to what I was searching google for, but it was listed on the first page. I guess your doing something right if Google likes you enough to put you on the first page of a non related search.