Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 37
do they remain ? A. There is a great difference in their duration;sometimes they remain only a few moments ; atothers, they continue for several days. Q. To how great an elevation do these oftenarise ? A. Sometimes to the height of eighty thousandmiles. Q. What is there peculiarly interesting in… … Q. Which way do these spots pass overdisc of the sun % A. They pass from east to west. In illustration (Fig. No. 9), describe theof the spot just entering upon the suns Q. formdisc. A.beinj Q. A. It appears oval in form, the greatest length at right angles to its motion across the sun. Does its…
Astronomy
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