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seen from Japan
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seen from United States
seen from Malaysia
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seen from Malaysia
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seen from South Korea
seen from United States
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seen from China
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The description and use of the sector, crosse-staffe, and other instruments : with a canon of artificiall Sines and Tangents, and the use thereof in astronomie, navigation, dialling and fortification by Edmund Gunter (1636)
A simple device to measure angles in sky. By measuring the angle between the horizon and Polaris an observer can determine their latitude
