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The astrolabe is an angular instrument that was invented over a thousand years ago and was widely used in astronomy until the late 18th century. It has much in common with the sextant.
The astrolabe is an angular instrument that was invented over a thousand years ago and was widely used in astronomy until the late 18th century. It has much in common with the sextant.
Lewis Carroll writes about military space programmes, policy, technology and the industry that supports the sector. He spent nearly two decades covering the military, the Pentagon, Congress and the defence industry as a journalist for Space Chatter magazine.