Lowell, Percival, 1855-1916 · New York, The Macmillan company · leaf 116
gular amount, that thespectroscope is concerned. Nevertheless, when a likenumber of plates were tried on him, they indicated onmeasurement a rotation time within an hour of the true.This corresponds to half an hour on Venus. We see,therefore, that had Venus day been anywhere in theneighborhood of… … Spectrogram of Jupiter, giving the length of its day by the tilt ofITS spectral lines — V. M. Slipher, Lowell Observatory. Jupiter is twelve times that of Venus, while the rotationtime is 9^ 5o^.4 at the equator, the precision attainedon Venus should here have been about a minute. Andthis is what…
Cosmogony
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