Lockyer, Norman, Sir, 1836-1920 · London : Macmillan and Co. · leaf 318
()nthe other hand, when they do happen, as the planet isprojected on the Sun, the Sun serves the purpose of amicrometer, and observations may be made with the mostrigorous exactness. The measure of the Suns distance—one of the noblest problems in astronomy, on whichdepends every measure in… … Fig. 60.—A Transit of Venus. 587. We have seen that when Venus crosses the Sunsdisc during its transit it appears as a round black spot.Let us suppose two observers placed at two differentstations on the Earth, properly chosen for observations ofihe phenomenon; one at a stationy^ in the northern…
Astronomy · Solar system
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