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September Night Sky

Neptune comes to opposition on September 2, and this is the best month to try to observe this elusive planet. It might seem strange that Neptune is so much harder to find than Uranus. The two planets are comparable in size and nature, and both are in the outer reaches of the solar system. But Neptune is much further out from the Sun than Uranus - an average of 4.5 Billion km to Uranus' 2.9 Billion. This has a double whammy effect on Neptune's apparent brightness from the Earth. The distance of Uranus to the Sun is only about 63% of Neptune's, but that means that Neptune only gets about 40% of the amount...

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