EditorialAn image from NASA of the Perseverance rover as it is lowered by the sky crane to the surface of Mars on Feb. 18, 2021. (NASA via The New York Times)
EditorialGerald Carr, commander of the Skylab 4 mission in 1973-74, demonstrates zero gravity in the space station, which crashed back to Earth by the time the space shuttles began flying in 1981. (NASA via The New York Times)
EditorialA new globe of the earth, in a leather case bearing, on its inner face, representations of the celestial hemispheres. A new globe of the earth by John Miller. Edinburgh : John Miller, 1793. Source: Maps C.4.a.5.(11).
EditorialCircumference of the Earth. Eratosthenes (250 BC) calculated the circumference of the Earth by measuring noontime shadows at two localities of different latitude. Leonardo da Vinci (1452-1519) developed a novel way to measure the area of a circle usin...
EditorialCircumference of the Earth. Eratosthenes (250 BC) calculated the circumference of the Earth by measuring noontime shadows at two localities of different latitude. Leonardo da Vinci (1452-1519) developed a novel way to measure the area of a circle usin...