Viking 1 Transit of Phobos from Mars

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in 1970s, viking 1 lander , orbiter photographed shadow well. lander detected penumbral shadow of phobos passing across it.


this detected slight dimming of ambient light; viking lander camera did not image sun. shadow took 20 seconds pass on lander, moving @ 2 km/s. shadow simultaneously imaged viking 1 orbiter, permitted locating position of lander in orbiter pictures.








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