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It would darken a little, like 1/100000000th or something rediculous, probably only detectable by electronic means, if at all.
The size of the earth as seen from Neptune would be only a fraction of that of the Sun, so we would be passing across the Sun's disk kinda like we see the Transits of Mercury and Venus, or even the Jovian moons cross Jupiter.
Edit: Actually, wouldn't be too difficult to calculate.... hmmm
Okay, here's a rough as guts answer. (Mean diameters from Wikipedia)
Diameter of Sun = 1392000km
Diameter of Earth = 12742km
or 1/109th the diameter of the Sun.
D1^2 / D2^2 = 11934.47
So I guess thats 1/11934th the area of the Sun.
That doesn't take into account the Earths orbital distance and therefore it's slight apparent increase in diameter as seen from Neptune. 'Tis beyond my math ability!, probably could work it out with Earths and Neptunes orbits and some trig.
Last edited by MrB; 15-08-2008 at 05:21 PM.
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