A Treatise on Spherical AstronomyUniversity Press, 1908 - 506 pàgines |
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Frases i termes més freqüents
a₁ aberration antinole apparent approximately ascending node assume Astronomy axis azimuth celestial sphere centre Coll constant coordinates corresponding cos² cosec culmination d₁ decl declination determined direction diurnal earth ecliptic ephemeris equation equatorial equinox error Exam expression follows formula geocentric given graduated great circle Greenwich mean Hence horizon horizontal parallax hour angle instrument intersection known latitude logarithms Math mean distance mean longitude mean noon measured meridian meridian circle moon moon's motion nole nutation obliquity observer obtain orbit parallel perpendicular planet point of Aries pole position angle precession quantities R₁ R₂ radius refraction respectively right ascension rotation semi-diameter sidereal day sin² spherical triangle star stereographic projection substitution sun's supposed tan² tangent telescope transit Trip true true anomaly velocity Venus whence y₁ zenith distance zero
Passatges populars
Pàgina 147 - Newton generalized the law of attraction into a statement that every particle of matter in the universe attracts every other particle with a force which varies directly as the product of their masses and inversely as the square of the distance between them; and he thence deduced the law of attraction for spherical shells of constant density.
Pàgina 146 - LAW I. Every body continues in its state of rest, or of uniform motion in a straight line, except in so far as it may be compelled to change that state by impressed forces.
Pàgina 299 - The squares of the periodic times of the planets are proportional to the cubes of their mean distances from the sun.
Pàgina 146 - Change of motion is proportional to the impressed force and takes place in the direction of the straight line in which the force acts.
Pàgina 425 - Up to now we have been explaining to the best of our ability the revolutions of the Earth around the sun and of the moon around the Earth.
Pàgina 4 - III., when two sides and an angle opposite to one of them are given...
Pàgina 13 - A cos 6 = cos a cos c + sin a sin c cos B cos c = cos a cos 6 + sin a sin 6 cos C Law of Cosines for Angles cos A = — cos B...
Pàgina 13 - Triangle to equations (I) they become t sin.- A cos. b = cos. B sin. C + sin. B cos. C cos. a ; I sin. A cos. c = cos. C sin. B + sin. C cos. B cos. a. sin. B cos. c = cos. C sin. A + sin. C cos. A cos.
Pàgina 146 - To every action there is always an equal and contrary reaction ; or, the mutual actions of any two bodies are always equal and oppositely directed in the same straight line.
Pàgina 1 - C = cos. c sin. a — sin. c cos. a cos. B ; I sin. b cos. A = cos. a sin. c — sin. a cos. c cos. B. i sin. c cos. A = cos. a sin.