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6 votes
1 answer
853 views

How did Vasco da Gama know about the Southern Cross?

It is said that the precession cycle of the Earth's axis takes about 26,000 years to complete. It is also said that the ancient Greeks could see Crux (aka the Southern Cross) from where they lived. It ...
Ricky's user avatar
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12 votes
1 answer
343 views

A world in the moon?

In the 1600s, the nature of the moon was a matter of debate. Papers arguing for the modern concept of the moon were being printed, such as The Discovery of a World in the Moone, 1638. The phrase a ...
Joe's user avatar
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