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 | A simple explanation of how the rotation of the earth causes night and day. |
| A simple explanation of how the rotation of the earth causes night and day. |
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 | In this title the author sets the stage by recounting the difficulties early navigators had in determining their exact longitude. After the loss of many ships and human lives, Parliament in 1714 offered a rich prize for a practical way to measure... |
 | In this title the author sets the stage by recounting the difficulties early navigators had in determining their exact longitude. After the loss of many ships and human lives, Parliament in 1714 offered a rich prize for a practical way to measure... |
