Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 98
ance is measured twice aseasily. But more than this, Mars is seen at night witha background of stars, and its position can be deter- THE SUNS DISTANCE 87 mined very accurately in relation to these stars.Cassini sent out an expedition to Cayenne, and thepositions of Mars were observed simultaneously… … Dia£. XLVI. Diag. XLVII. simultaneously at Cayenne the angle MCc, then, sincethe radii of the Earth, EC and EP, are known, andalso the angle PEC from the positions of Parisand Cayenne on the Earths surface, there is enoughdetermined to draw the diagram accurately to scale,and thus find the distance…
Astronomy
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