Accretion: A collection of influential papers by A. Treves, L. Maraschi, M. Abramowicz

By A. Treves, L. Maraschi, M. Abramowicz

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C. c. The heavens were sometimes depicted as an external sphere, such as that shown in the Etruscan depiction of Atlas holding up the sky sphere. Not every culture, however, depicted the sky as a hemispherical bowl; 14 2. 1. Diurnal arcs traced out by stars during a time exposure near the North Celestial Pole. Trails further from the pole appear straighter because the radii of curvature of their diurnal circles is larger. A. Clark. in ancient Egypt, the sky was pictured as the body of the goddess Nut, for example.

A. Clark. in ancient Egypt, the sky was pictured as the body of the goddess Nut, for example. The shape of the sky as we perceive it depends on several factors: physiological, psychological, and cultural. We can even measure the perceived shape (see Schlosser et al. 1991/1994, pp. 1–3). For the purposes of locating objects on the sky, however, we use, even today, the concept of the celestial sphere. 2. The Horizon or “Arabic” System The image of an Earth surrounded by pure and perfect crystalline spheres5 was emphasized by Aristotle, among others.

116). Even in the Almagest, Ptolemy gives a position of a star in a kind of ecliptic coordinate; referring to the beginning of the first point of a zodiacal sign, he also gives an ecliptic latitude. 1). Yet when Galileo noticed a faint object while studying the satellites of Jupiter, he was unable to track and follow the object because his telescope mounting lacked coordinates to record and rediscover it once Jupiter’s relatively large motion had moved away from the field. The faint object was not knowingly discovered until after calculations by John Couch Adams (1819–1892) and Urbain Jean Joseph Leverrier (1811–1877) in the 19th century.

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