Tom Wagner wrote: > Finally, I determined that they can never see anything N or S > of about 63 degrees or so. Therefore no observer N or S of those > latitudes will ever see the ISS come over the horizon. > > Will someone tell me if my estimates are correct? Your result is off by quite a few degrees. You need to compute the Earth central angle between the radius to the satellite and the radius to the point on the Earth at the satellite's horizon, as depicted here: http://satobs.org/seesat_ref/misc/Central_angle.pdf Since the radius from the satellite to its horizon is tangent to the Earth's surface, the solution involves a right triangle, which requires only basic trigonometry. Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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