Uranography and practical astronomy, designed for private students (1866)
Lillard, L. [from old catalog] · Keokuk, Rees' book and job office print · leaf 17
y seven times as great as that of the earth — a temperature more than sufficient to make water boil. Mercury's light is also seven times as intense as ours, and the sun as seen from this planet would appear seven times as large as it does to us. Mercury's orbit deviates from a circle much more than…
Astronomy
Internet Archive · The Library of Congress · Public domain (published before 1931). Free to use for anything.
