Jones, H. Spencer (Harold Spencer), 1890- · London E. Arnold & co. · leaf 296
(a) Thkke Minor Pi.ankt Trails. … 7,.;,., ,„„■//.„(li) Hallev,s Comkt ami Nents, 1910. THE PLANETS 257 the blue. The portions ab, cd are due to portions of the ringwhich are moving towards and away from the observer and aredisplaced towards blue and red respectively. The displace-ments of the outer extremities a, d are, however,…
Astronomy
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