# How long does it take to observe a full rotation of the sun from earth?

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mattforteposted 6 years ago

How long does it take to observe a full rotation of the sun from earth?

I know the sun rotates on it's own axis about once a month (exact time varies by attitude). But I can't find information on how long it takes to observe a full rotation. Since earth orbits the same direction that the sun rotates, it would obviously take longer than a month to record a full rotation from an earth satellite. I'm curious as to how long that would be.

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Lou Lohmanposted 6 years ago

If we assume the period of rotation for the Sun is 1 month, and the rotation of the Sun and revolution of the Earth are the same direction, then a full rotation observed from Earth would take approximately 1 month, 2 days, 17 hours, and 27 minutes.

Set it up as a line graph.  In slope-intercept form, the Sun could be represented as "x - 1", and the Earth would be "0.08333x".  This sets x up as the time, so you'd find the value of x at the intercept point of the two lines.  Solving for x is a matter of saying:

x - 1 = 0.08333x
0.91667x = 1
x = 1.090909

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mattforteposted 6 years agoin reply to this

I figured it'd be a fairly simple math equation, thanks!

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