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[AZ-Observing] Re: Space Station Lunar Transit Picture
- From: "Dan Heim" <dan@xxxxxxxxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Tue, 15 Apr 2008 10:22:56 -0700
FYI, the parallax can be calculated from a long skinny right triangle with
its vertex at the ISS (assuming the Moon at infinity and ISS at 350 km). It
goes like:
tan(parallax)=(horizontal displacement)/(350 km)
So, for example, a half-degree parallax (the width of the full moon),
translates into:
horizontal displacement = tan(0.5) x (350 km) = (0.0087) x (350 km) = 3 km.
Earth curvature introduces a slight error into this calculation, but it's
not significant for such small angles. I watched the event from New River,
and the ISS appeared to pass about 5 degrees south of the Moon. Excellent
image Tom! Wish I coulda' been there.
Dan Heim
President
Desert Foothills Astronomy Club
http://www.dfacaz,org
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