Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 136
(a) Stix-SiOT Group. 1920 Makcii 21. … (b) SUN-SlOT VOKTICF.S. 190S OCTOBER 7. THE SUN 117 of gravity at the surface of the Sun is therefore about 27 timesas great as at the surface of the Earth. 68. The Rotation of the Sun.—If the surface of the Sunis observed through, a telescope, one or more dark spots willusually be observed on its…
Astronomy
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