File:Voyage in Space page201.png
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Summary
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| Description |
English: Waxing and waning of sunspots, 1770-1880. The low peaks in 1804, 1817 & 1830 represent the w:Dalton Minimum. |
| Date | |
| Source | A Voyage in Space[1]. |
| Author | Herbert Hall Turner |
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The author died in 1930, so this work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 80 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 15:19, 22 December 2015 | | 1,552 × 1,055 (494 KB) | Keith Edkins (talk | contribs) | {{Information |Description={{en|1=Waxing and waning of sunspots, 1770-1880. The low peaks in 1804, 1817 & 1830 represent the w:Dalton Minimum.}} |Source=A Voyage in Space[https://archive.org/details/voyageinspacecou00turnrich]. |Author=Herbert Hal... |
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