By Patrick Moore
The recent Philip's Astronomy Encyclopedia is without doubt one of the such a lot finished, authoritative and available books on astronomy. in additional than 3000 alphabetically equipped articles and over 500 images and diagrams, it covers every little thing and everybody from the Anglo-Australian Observatory to Fritz Zwicky. Its 464 pages contain a bunch of significant articles on matters equivalent to our Galaxy, the solar and planets, optical and radio telescopes, stars, black holes, astrophysics, observatories, astronomical images, house programmes, the constellations and recognized astronomers. helping those articles are shorter entries on planetary gains and satellites, asteroids, observational ideas, comets, satellite tv for pc launchers, meteros, and matters as various as lifestyles within the Universe and the constitution of meteorites. rankings of tables checklist the brightest stars within the significant constellations, annual meteor showers, significant variable stars, dwarf stars, power creation tactics within the solar, and different proper info. Philip's Astronomy Encyclopedia is written through greater than a hundred major astronomers from the world's universities and observatories, each one a professional in a really expert box of information. they've got produced an updated and trustworthy renowned reference paintings for 2001 and past.
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Extra resources for Philip's Astronomy Encyclopedia: A comprehensive and authoritative A-Z guide to the Universe (Revised Edition)
See also ATEN ASTEROID; AMOR ASTEROID Apollonius of Perga (262–190 BC) Greek mathematician and astronomer, known as the Great Geometer. His most famous published work was the eight-volume Conics, which deals with the geometry of conic sections – the circle, ellipse, parabola and Apollo programme Name given to the US programme to land men on the Moon and return them safely to Earth. The cost of the NATIONAL AERONAUTIC AND SPACE ADMINISTRATION’s (NASA’s) triumph in the Moon race with the Soviet Union was US$25 billion.
E. Dreyer. Today’s research topics include stellar physics and Solar System dynamics. NEW GENERAL CATALOGUE armillary sphere Oldest known type of astronomical instrument, used for both observing the heavens and teaching. It is a skeletal celestial sphere, the centre of which represents the Earth-bound observer. A series of rings represent great circles such as the equator and the ecliptic, while other rings represent the observer’s horizon and meridian. The armillary sphere can be rotated to show the heavens at a particular time of day.
Aristarchus reckoned the Sun’s and Moon’s distances by measuring the apparent angle between the Earth and Sun during the first quarter Moon, when the Moon–Sun angle is 90º. Though his method was mathematically valid, the exact moment at which the Moon was 50% illuminated proved very difficult to measure in practice, and any slight error in its value would introduce gross errors in the final result. Aristarchus observed the Sun–Earth–Moon angle as 87º, determining that the Sun was twenty times as far from the Earth as the Moon, and hence was twenty times the actual size of our natural satellite.