RE: Many consecutive visible ISS passes

From: Bruno Tilgner (
Date: Mon Aug 06 2001 - 10:07:19 PDT

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    How many consecutive passes of ISS can be seen depends, as has
    been pointed out, on local circumstances and the eyesight of
    the observer. The first condition to be met is that ISS must
    be in continuous sunlight for an extended period of time. This
    was last the case between 01 June 2001 at 00:56 UTC and 04 June
    2001 at 19:46 UTC. ISS spent 90 hours and 53 minutes in continuous
    The part of an orbit which is in shadow can be calculated from
    the right ascension and declination of the Sun and, as far as
    a circular orbit is concerned, from the right ascension of its
    ascending node (RAAN), its inclination and its semi-major axis.
    I don't want to annoy the list with the formulas, but if someone
    is interested I'll communicate them privately. 
    Bruno Tilgner
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