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 sunlight. 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 ----------------------------------------------------------------- Unsubscribe from SeeSat-L by sending a message with 'unsubscribe' in the SUBJECT to SeeSat-L-request@lists.satellite.eu.org http://www2.satellite.eu.org/seesat/seesatindex.html
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