The Elements of Theoretical And Descriptive Astronomy, for the Use of Colleges And Academies
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In our eReader you can find the full English version of the book. Read The Elements of Theoretical And Descriptive Astronomy, for the Use of Colleges And Academies 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 The Elements of Theoretical And Descriptive Astronomy, for the Use of Colleges And Academies
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Lockyer, " sun-spots are cavities or hollows eaten into the photosphere, and these differ- ent shades [the penumbra, umbra, and nucleus] represent differ- ent depths." [See Note, page 99.] One very curious and interesting discovery in relation to these spots is that of a periodicity in their number. This discovery was made by Schwabe, of Dessau, whose researches and obser- vations on this subject covered a period of about forty-three years. The number of groups of spots which he observed in a y...ear varied from 33 to 333, the average being not far from 150.* He found the period from one maximum to another to be about ten years. Professor Wolf, of Zurich, after tabulating all the ob- servations of spots since 1611, decided that the period varied from eight to sixteen years, its mean value being about eleven years.
Eecent investigations show that this periodicity is in some way connected with the action of the planets, of Jupiter and Venus particularly, upon the sun's photosphere. It is a curious fact that magnetic storms and the phenomenon called Aurora or Northsrn Lights have a similar period, and are most frequent and most striking when the number of the solar spots is the greatest.
What to read after The Elements of Theoretical And Descriptive Astronomy, for the Use of Colleges And Academies?
You can find similar books in the "Read Also" column, or choose other free books by Charles J Charles Joyce White to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Lockyer, " sun-spots are cavities or hollows eaten into the photosphere, and these differ- ent shades [the penumbra, umbra, and nucleus] represent differ- ent depths." [See Note, page 99.] One very curious and interesting discovery in relation to these spots is that of a periodicity in their number. This discovery was made by Schwabe, of Dessau, whose researches and obser- vations on this subject covered a period of about forty-three years. The number of groups of spots which he observed in a y...ear varied from 33 to 333, the average being not far from 150.* He found the period from one maximum to another to be about ten years. Professor Wolf, of Zurich, after tabulating all the ob- servations of spots since 1611, decided that the period varied from eight to sixteen years, its mean value being about eleven years.
Eecent investigations show that this periodicity is in some way connected with the action of the planets, of Jupiter and Venus particularly, upon the sun's photosphere. It is a curious fact that magnetic storms and the phenomenon called Aurora or Northsrn Lights have a similar period, and are most frequent and most striking when the number of the solar spots is the greatest.
What to read after The Elements of Theoretical And Descriptive Astronomy, for the Use of Colleges And Academies?
You can find similar books in the "Read Also" column, or choose other free books by Charles J Charles Joyce White to read onlineMoreLess
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