I don't get why ISS passes vary so much in brightness.
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Replying to @michael_nielsen
@vgr So rotation isn't the answer, assuming YA can be trusted.1 reply 0 retweets 0 likes
Replying to @michael_nielsen
@michael_nielsen Orbit eccentricity is also near zero, so that can't be it.
3:49 PM - 3 Aug 2015
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