Astronomical dialogues, for the instruction of youth ... The second edition, etc
What is a total Eclipse 9aWhen the Sun or Moon is wholly covered by the intervening body. 294. How much of the Earth is entirely darkened in a total Eclipse of the Sun ?About 180 miles. 295. What is the Penumbra 2aA faint or imperfectanbsp;...
| Title | : | Astronomical dialogues, for the instruction of youth ... The second edition, etc |
| Author | : | John SHARMAN (Geographer) |
| Publisher | : | - 1821 |
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