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A digital sextant

Sextants are wonderfully analog optical devices. A sextant user from the 1850s would have little problem using a modern sextant. Now a company in South Korea has begun offering something it calls the Korea Digital Sextant (KDS) that digitalizes…

Weather, October 2020

Omega blocks Upper atmosphere winds, blowing across the earth from west to east at speeds from 50 to 150 knots, help create and influence surface weather. Viewed from above Earth, these winds move along paths resembling ocean waves in profile.…