Letters on Astronomy: Addressed to a Lady; in which the Elements of the Science are Familiarly Explained in Connexion with Its Literary HistoryMarsh, Capen, Lyon and Webb, 1841 - 419 |
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Strona 19
... position of any place , either on the surface of the earth or in the heavens , both the earth and the heavens are conceived to be divided into separate portions , by circles , which are imagined to cut through them , in various ways ...
... position of any place , either on the surface of the earth or in the heavens , both the earth and the heavens are conceived to be divided into separate portions , by circles , which are imagined to cut through them , in various ways ...
Strona 23
... position of a celestial body is referred to the equator by its right ascension and declination . Right ascension is the angular distance from the vernal equi- nox measured on the equator . If a star is situated on the equator , then its ...
... position of a celestial body is referred to the equator by its right ascension and declination . Right ascension is the angular distance from the vernal equi- nox measured on the equator . If a star is situated on the equator , then its ...
Strona 26
... position of the two poles of the earth . Applying the thumb and finger of the left hand to the poles , and holding the apple so that the poles may be in a north and south line , turn this globe from west to east , and its motion will ...
... position of the two poles of the earth . Applying the thumb and finger of the left hand to the poles , and holding the apple so that the poles may be in a north and south line , turn this globe from west to east , and its motion will ...
Strona 27
... positions before the eye . If we hold it parallel to the face , with the whole breadth opposite to the eye , we see it as an entire circle . If we turn it a little sideways , it appears oval , or as an ellipse ; and , as we continue to ...
... positions before the eye . If we hold it parallel to the face , with the whole breadth opposite to the eye , we see it as an entire circle . If we turn it a little sideways , it appears oval , or as an ellipse ; and , as we continue to ...
Strona 29
... position of a heav- enly body by its azimuth and altitude , or by its right as- cension and declination , or by its longitude and latitude , you will now enter with advantage upon an account of those instruments , by means of which our ...
... position of a heav- enly body by its azimuth and altitude , or by its right as- cension and declination , or by its longitude and latitude , you will now enter with advantage upon an account of those instruments , by means of which our ...
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angle appear ascertain astronomers atmosphere attraction axis called celestial centre circle comet conjunction constellation degrees diameter direction discovery disk distance diurnal motion doctrine double stars earth ecliptic equal equator equinox exhibited fact fixed stars force Galileo globe gravity greater greatest half Halley's comet heavenly bodies heavens Hence Herschel horizon hundred 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 Nature 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 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