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to remarkable results. Obviously the east-
erly motion of the satellite overwhelms the
diurnal rotation of the planet, and Phobos
must appear to the inhabitants, if they ex-
ist, to rise in the west and set in the east,
showing two or even three full moons in a
day, so that, sufficiently well for the ordi-
nary purposes of life, the hour of the day
can be told by its phases.
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