. Collier's nuova enciclopedia : un loose-foglia e auto-revisione di riferimento di lavoro ... con 515 illustrazioni e novantasei mappe. brillante lavoro di SirWilliam Herschel, che scoprì theplanet Urano e i suoi quattro satelliti e due ulteriori satelliti di Saturno;determinata la direzione del motionof il sistema solare nello spazio; resolvedthe Via Lattea in innumerevoli myriadsof stelle e aperto una boundlessfield di scoperta e di ricerca amongthe nebulose e doppia e multiplestars. Maskelyne messo a punto il metodo ofreducing osservazioni di lunar distancesat mare per la determinazione di longi-tud
1306 x 1913 px | 22,1 x 32,4 cm | 8,7 x 12,8 inches | 150dpi
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. Collier's new encyclopedia : a loose-leaf and self-revising reference work ... with 515 illustrations and ninety-six maps. brilliant work of SirWilliam Herschel, who discovered theplanet Uranus and its four satellites, and two additional satellites of Saturn;determined the direction of the motionof the solar system in space; resolvedthe Milky Way into countless myriadsof stars, and opened up a boundlessfield of discovery and research amongthe nebulae and double and multiplestars. Maskelyne perfected the method ofreducing observations of lunar distancesat sea for the determination of longi-tudes, and had tables of lunar distancesfirst published in the British NauticalAlmanac. Lalande observed the posi-tions of by far the largest number of stars that had been catalogued up to theend of the 18th century. These wfereafterward reduced and published byBaily in a catalogue which contains over47, 000 star positions. Mayer, besidesmaking a valuable catalogue of zodiacalstars at about the same time as thoseof Bradley and Lacaille, perfected lunartables which were for many years themost accuiate in existence. The 18th. MT. WILSON OBSERVATORY and 19th centuries were astronomicallyconnected by the work of Piazzi in theobservatory established at Palermo in1790, where on the night of Jan. 1, 1801, a new planet, the first of the numerousbelt of planetoids between Mars andJupiter, was discovered. Modern Astronovvy.—Friedrich Wil-helm Bessel contributed more than anyother to the solid advancement of thescience in the 19th century. Bessel com-bined in an extraordinary degree thequalities of an able mathematician anda skillful observer. Before mentioningparticularly any of the other prominentastronomers of the early part of the19th century, the celebrated opticianFraunhofer, who contributed so much totheir success, deserves special notice. Inconnection with his experiments on lightfor the further perfection of his lenses, Fraunhofer was led to the discovery of ASTRONOMY 320 ASTRONOMY t
