Letters on Astronomy, Addressed to a Lady: in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary History: With Numerous Engravings |
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Page 19
... passing through its centre at right angles to its plane . The pole of a great circle is the point on the sphere ... passes through the pole of another great circle , cuts the latter at right angles . The great circle which passes through ...
... passing through its centre at right angles to its plane . The pole of a great circle is the point on the sphere ... passes through the pole of another great circle , cuts the latter at right angles . The great circle which passes through ...
Page 20
... passes through the north and south points . The prime vertical is that vertical circle which pas- ses through the east and west points . The altitude of a body is its elevation above the ho- rizon , measured on a vertical circle . The ...
... passes through the north and south points . The prime vertical is that vertical circle which pas- ses through the east and west points . The altitude of a body is its elevation above the ho- rizon , measured on a vertical circle . The ...
Page 21
... passing through the poles of the equator , —are called meridians , because that secondary which passes through the zenith of any place is the meridian of that place , and is at right angles both to the equator and the horizon , passing ...
... passing through the poles of the equator , —are called meridians , because that secondary which passes through the zenith of any place is the meridian of that place , and is at right angles both to the equator and the horizon , passing ...
Page 22
... passes through the place and the meridian of Greenwich . The ecliptic is a great circle , in which the earth performs its annual revolutions around the sun . It passes through the centre of the earth and the centre of the sun . It is ...
... passes through the place and the meridian of Greenwich . The ecliptic is a great circle , in which the earth performs its annual revolutions around the sun . It passes through the centre of the earth and the centre of the sun . It is ...
Page 23
... passes through the equinoctial points . From this meridian , right ascension and celestial longi- tude are reckoned , as longitude on the earth is reckon- ed from the meridian of Greenwich . The solstitial colure is the meridian which ...
... passes through the equinoctial points . From this meridian , right ascension and celestial longi- tude are reckoned , as longitude on the earth is reckon- ed from the meridian of Greenwich . The solstitial colure is the meridian which ...
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Common terms and phrases
angle appear ascertain astronomers atmosphere attraction axis called celestial centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion diurnal revolution doctrine double stars earth ecliptic equal equator equinox exhibit fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon inferior conjunction instrument John Herschel Jupiter Kepler latitude laws length less light longitude lunar lunar eclipse magnitude measure Mercury meridian meteors millions of miles minutes moon moon's motion move nearer nearly node objects observations opposite orbit parallax passing perihelion period phenomena planetary planets pole respect revolve right ascension ring round satellites Saturn seen shadow side solar system space spectator sphere sun's superior planets supposed surface telescope thousand tides tion truth Tycho Tycho Brahe universal gravitation Uranus velocity Venus vernal equinox visible west to east