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A Text-Book of Astronomy

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Excerpt: ...of the individual spots were large enough to contain the earth if it had been dropped upon them. From Fig. 67 determine in miles the length of the group on August 14th. Fig. 71 shows an enlarged view of these spots as they appeared on August 17th, and in this we find some details not so well shown in the preceding pictures. The larger spots consist of a black part called the nucleus or umbra (Latin, shadow), which is surrounded by an irregular border called the penumbra (partial shadow), which is intermediate in ...

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A Text-Book of Astronomy
2018, Franklin Classics

ISBN-13: 9780342846474

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A Text-Book of Astronomy
2018, Franklin Classics

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A Text-Book of Astronomy
2018, Franklin Classics Trade Press

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A Text-Book of Astronomy
2018, Franklin Classics Trade Press

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A Text-Book of Astronomy
2018, Outlook Verlag

ISBN-13: 9783734034985

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A Text-Book of Astronomy
2018, Outlook Verlag

ISBN-13: 9783734034992

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A Text-Book of Astronomy
2017, Createspace Independent Publishing Platform

ISBN-13: 9781544286334

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A Text-Book of Astronomy
2016, Palala Press

ISBN-13: 9781357521691

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A Text-Book of Astronomy
2015, Andesite Press

ISBN-13: 9781296515737

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A Text-Book of Astronomy
2014, Createspace Independent Publishing Platform

ISBN-13: 9781502379467

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A Text-Book of Astronomy
2010, Nabu Press, Charleston SC

ISBN-13: 9781143091827

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A Text-Book of Astronomy
2010, Nabu Press, Charleston SC

ISBN-13: 9781177500975

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