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Astronomy |
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Andromeda "The constellation Andromeda, including its stars down to 5th magnitude, according to Heis; the figure from Ptolemy's description."-Whitney, 1902... |
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Annual Parallax "Suppose a to be a stationary celestial object, then as the Earth makes her annual revolution around the Sun S, this object at one time will appear among the stars at e, but six months after, when the... |
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Aquarius "A zodiacal constellation, supposed to represnt a man standing with his left hand extended upward, and his right pouring out a vase a stream of water, which flows into the mouth of a southern fish."-W... |
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Aquila "A northern constellation situated in the Milky Way, nearly south of Lyra, and containing the bright star Altair."-Whitney, 1902... |
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Ara "The Contellation Ara; One of the 15 ancient southern constellations; the Altar."-Whitney, 1902... |
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Aries "The Constellation Aries."-Whitney, 1902... |
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Armilla "Armillary Sphere, an instrument used in astronomy. In its simplest form, consisting of a ring fixed in the plane of the equator, the armilla is one of the most ancient of astronomical instruments. ... |
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Armillary Sphere "An arrangement of rings, all circles of a single sphere, intended to show the relative positions of the principal celestial circles."-Whitney, 1902... |
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Astrolabe "Sir Francis Drake's Astrolabe; an obsolete astronomical instrument of different forms, used for taking the altitude of the sun or stars, and for the solution of other problems in astronomy. "-Whitney... |
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Astrolabe "Originally used for any instrument used for observing stars; afterwards used for an instrument for measurement of altitute; replaced, in modern times, by the quadrant." — Williams, 1889... |
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Astrolabe, Later A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.... |
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Astrolabe, Regiomontanus' A historical astronomical instrument used to predict positions of the Sun, Moon, planets and stars.... |
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Aurora Borealis Auroras are caused by the passage of electricity through the rare air of the upper regions. ... |
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Austrinus, Piscis An ancient southern constellation, the Southern Fish. ... |
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Axis Inclination of Axis to Orbit and Ecliptic.... |
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Backstaff An improvement upon the jackstaff from Davis, the Arctic navigator.... |
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Big Dipper The Big Dipper is used to find the North Star.... |
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Binocular Telescope Binocular telescopes, or binoculars (also known as field glasses), are two identical or mirror-symmetrical telescopes mounted side-by-side and aligned to point accurately in the same direction, allowi... |
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Binoculars Boulanger succeeded in producing a binocular of an entirely new type in 1859.... |
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Binoculars The model of binoculars invented by E. Abbe.... |
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Cassiopeia Constellation: Cassiopeia... |
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Cause of the Phases of the Moon During new and full moon, the earth, moon, and sun are all in the same straight line, but, that during the first and last quarters, they are at right angles. The portions of the earth and moon turned ... |
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Constellation Corvus The Corvus constellation of a crow or raven.... |
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Constellation, Auriga One of 48 constellatioins by Ptolemy. ... |
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Constellation, Sagittarius A southern zodiacal constellation and sign. ... |
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