THE SATELLITES OF MARS.

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Name. | Mean Distance from | Periodic Time.

| Centre of Mars. |

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| | Hrs. Mins. Secs.

Phobos | 5,800 miles. | 7 39 14

Deimos | 14,500 ” | 30 17 54

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Star-land: Being Talks With Young People About the Wonders of the Heavens · 第 115 / 146 题