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 6
... Gravity , 134 LETTER XIV . Sir Isaac Newton . - Universal Gravitation . - Figure of the Earth's Orbit . - Precession of the Equinoxes , 143 LETTER XV . The Moon , LETTER XVI . 157 The Moon . - Phases . - Harvest Moon . - Librations ...
... Gravity , 134 LETTER XIV . Sir Isaac Newton . - Universal Gravitation . - Figure of the Earth's Orbit . - Precession of the Equinoxes , 143 LETTER XV . The Moon , LETTER XVI . 157 The Moon . - Phases . - Harvest Moon . - Librations ...
Strona 79
... gravity at those places . But when we know the relative forces of gravity at different places , we know their relative distances from the centre of the earth ; because the nearer a place is to the centre of the earth , the greater is ...
... gravity at those places . But when we know the relative forces of gravity at different places , we know their relative distances from the centre of the earth ; because the nearer a place is to the centre of the earth , the greater is ...
Strona 80
... gravity ; and there , also , its effects are traced . At length , we apply our meas- ures to the surface of the earth itself , and find the same fact , which had thus been searched out among the hid- den things of Nature , here palpably ...
... gravity ; and there , also , its effects are traced . At length , we apply our meas- ures to the surface of the earth itself , and find the same fact , which had thus been searched out among the hid- den things of Nature , here palpably ...
Strona 82
... ( gravity ) which binds us to the earth as truly as though we were fastened to it by some invisible cords or wires , as the needle attaches itself to all sides of a spherical load- stone . We should dwell on this point , until it appears ...
... ( gravity ) which binds us to the earth as truly as though we were fastened to it by some invisible cords or wires , as the needle attaches itself to all sides of a spherical load- stone . We should dwell on this point , until it appears ...
Strona 103
... gravity in a body is greater , in proportion as its quantity of matter is greater . Consequently , we might suppose , that the weight of a body ( weight being nothing else than the measure of the force of gravity ) would be increased in ...
... gravity in a body is greater , in proportion as its quantity of matter is greater . Consequently , we might suppose , that the weight of a body ( weight being nothing else than the measure of the force of gravity ) would be increased in ...
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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