"THE COMET OF 1702. - MARALDI, G.F., DE LA HIRE, BIANCHINI, CASSINI, CASSINI LE FILS.
Reference : 45591
(1704)
(Paris, Jean Boudot, 1704). 4to. Without wrappers. Extracted from ""Mémoires de l'Academie des Sciences"". Année 1702. Pp. 101-134 and 4 folded engraved plates (celestial maps).
First printing of these 5 papers accounting the observations of the comet. Bianchini and Maraldi discovered the comet in the morning sky on April 20, 1702. The comet was a short distance above the horizon and was said to resemble a ""nebulous star"".An independent discovery was made by Maria Margarethe Kirch (Berlin, Germany on April 21, 1702 and by Philippe de la Hire (Paris, France) on April 24. The last observation of the comet was made by Bianchini and Maraldi on May 5, 1702.
Mercure De France, 1921. ouvrage au format In 8 couronne , Dos à quatre nerfs titre frappé à froid, 392 pages Relié postérieurement en demi chagrin noir . Ensemble en bon état . Pagination un peu fanée, plats frottées , coins émoussés, tranche convenable.
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Uppsala, C.A. Leffler, 1862. 4to. Later blank boards. Uncut. Offprint from ""Nova Acta Reg.Soc. Sc. Ups."". 10 pp. and 1 folded plate.
First edition. In this paper Ångström deduces the mean period of Halley's Comet by a statistical approach. From his analysis he discovered that the average time between perihelions was 76.93 years and found that thsi period varied in a cyclical manner.Ångström was one of the early formulators of the science of modern spectroscopy" he wrote extensively on terrestrial magnetism, the conduction of heat, and especially spectroscopy. He published a monumental map of the normal solar spectrum that expressed the length of light waves in units of one ten-millionth of a millimeter, a unit of length now known as the angstrom. He discovered that hydrogen is present in the sun's atmosphere, and he was the first to examine the spectrum of the aurora borealis.