Page 381 - 89 history of astronomy_opt

astrographic chart just completed. Photog-
raphy has come to be of use, not only for
depicting the sun and moon, comets and
nebulae, but also to obtain accurate relative
positions of neighbouring stars; to pick up
objects that are invisible in any telescope;
and, most of all perhaps, in fixing the posi-
tions of faint satellites. Thus Saturn’s dis-
tant satellite, Phoebe, and the sixth and
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