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I'd like know how sites like helloearth.us or satflare.com/iss calculate the time until the ISS enters/leaves darkness (sunrise/sunset).

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closed as unclear what you're asking by a CVn, ForgeMonkey, TildalWave Jan 25 '15 at 13:28

Please clarify your specific problem or add additional details to highlight exactly what you need. As it's currently written, it’s hard to tell exactly what you're asking. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ You might want to take a gander at this article $\endgroup$ – Everyone Jan 18 '15 at 13:17
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    $\begingroup$ Calculate the time when the ISS orbit intersects the earth's shadow cone. Exactly what are you looking for? Equations? $\endgroup$ – oefe Jan 18 '15 at 13:42

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