Astronomy
Astronomy
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In our eReader you can find the full English version of the book. Read Astronomy Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Astronomy
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[§ iv.
black spots are frequently seen on its surface, and these, indeed, are sometimes of sufficient ^ize to be visible without the telescope.
196. In the neighbourhood of the spots brighter portions than the general surface are seen : these are called faculae, and probably are immense banks of brighter vapours several thousands of miles long.
If the spots and faculae be watched from time to time they will be found to be constantly changing their shape.
§ IV.— SUNSPOTS.
197. Although the sun i...s so far away from us» in consequence of its immense size and the violence of the forces at work, these spots are fine objects in the telescope. I give a drawing of one (Fig. 40) so large that several Earths might have been hurled into it.
198. If these spots be observed and their positions cjirefully noted, and again observed one or two days afterwards, they will be found to have changed their position towards the west, and they will be seen to be gradually moving from the east side of the sun's disc to the west, where they will gradually disappear.
What to read after Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Lockyer, Joseph Norman, Sir, 1836-1920 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
[§ iv.
black spots are frequently seen on its surface, and these, indeed, are sometimes of sufficient ^ize to be visible without the telescope.
196. In the neighbourhood of the spots brighter portions than the general surface are seen : these are called faculae, and probably are immense banks of brighter vapours several thousands of miles long.
If the spots and faculae be watched from time to time they will be found to be constantly changing their shape.
§ IV.— SUNSPOTS.
197. Although the sun i...s so far away from us» in consequence of its immense size and the violence of the forces at work, these spots are fine objects in the telescope. I give a drawing of one (Fig. 40) so large that several Earths might have been hurled into it.
198. If these spots be observed and their positions cjirefully noted, and again observed one or two days afterwards, they will be found to have changed their position towards the west, and they will be seen to be gradually moving from the east side of the sun's disc to the west, where they will gradually disappear.
What to read after Astronomy?
You can find similar books in the "Read Also" column, or choose other free books by Lockyer, Joseph Norman, Sir, 1836-1920 to read onlineMoreLess
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