Date: 1999 - 2000
It comes curious to me, how scientists say one planet is
tilted 23 1/2 degrees and other is 34 degrees or 56, etc. . What
factors of planets does scientist examine when they calculate how much the
planet is tilted? Does it have to do with the magnetic force from the poles?
You look at the plane in which the planets are moving about the sun, and
compare this with the axis about which a planet is rotating.
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Update: June 2012