Star-land; being talks with young people about the wonders of the heavens (1899)
Ball, Robert Stawell, Sir, 1840- [from old catalog] · Boston and London, Ginn & company · leaf 52
tslowly round. The spot will be found to go through HOW THE SPOTS HELP US. 39 the changes that we have seen. We start with the spotnear the left, it moves across the face, and then passesto invisibility by moving behind the globe until it reap-pears again, after having moved round the back. Asthe… … Fig. 17.— How the Sun turns round. covery is made. We first observe the fact that thespots do always appear to move. Then we try toaccount for this, and we find a very simple explanation,by supposing that the whole sun, spots and all, turnssteadily round and round. It can also be proved in avery…
Astronomy
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