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

  • $\begingroup$ 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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