Conjugate Systems of Space Curves with Equal Laplace-Darboux by Wilczynski E.J.

By Wilczynski E.J.

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It is this rotation, he explains, that makes the night sky appear to move above us. His work also looks at the relationships between the Sun, the Earth, and the Moon. He is the first to compute the ratio between lunar orbits and rotations of the Earth, and also to calculate the length of the solar orbit. In measuring time, Aryabhata determined that the length of a year is 365 days, six hours, 12 minutes, 30 seconds, an extremely close calculation to the modern standard of 365 days, six hours. Much of his work concerns the Moon.

He collaborated with Swiss astronomer FRITZ ZWICKY on supernovae and neutron stars, and with Rudolf Leo Bernhard Minkowski on radio sources as they pertained to Cygnus A and others. But it was taking advantage of wartime blackouts and peering into Andromeda that led to his greatest discoveries, in which he determined through new classifications of stars that the galaxy was twice as big and twice as old as scientists had previously imagined. Baade was born in Schröttinghausen, Germany, on March 24, 1893.

He was the first to suggest the notion that interstellar matter occurs in the form of clouds. Some of his most important work took place in 1955, when he proposed that certain galactic radio sources indicated the occurrence of violent explosions at the centers of these particular galaxies. The English translation of his influential textbook, Theoretical Astrophysics, appeared in 1958 and became standard reading for astronomers-in-training around the globe. His fellow scientists publicly acknowledged Ambartsumian’s technical contributions and leadership by electing him president of the International Astronomical Union (1961–64) and president of the International Council of Scientific Unions (1970–74).

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