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15 degrees 24 hours angle Antarctic Circle astronomer atmosphere attraction axis calculated cause celestial bodies centre Ceres circle Comet constellations Crab diagram disk divided Earth Earth moves Earth round Earth's orbit eclipse equal equator equinox fixed stars Georgium Sidus globe gravity half happen hence Herschel horizon inclination inhabitants Jupiter less let us suppose light and heat luminous lunation Mercury meridian millions of miles minutes Moon Moon's motion move round nearer nearest nearly nodes north pole observations opposite orbit oval owing parallax pass path planetary planets pole star precisely quarter reckoning refractive represent revolution revolve round the Earth round the Sun Saturn seen shadow shew shewn side Solar solstice south pole spots starry sphere Sun appears Sun's rays surface telescope termed tides tion transit of Venus tropic of Cancer tropic of Capricorn true place velocity Venus vernal equinox Vesta visible whole Zodiac
Página 161 - ... a degree of brightness about as strong as that with which such a coal would be seen to glow in faint daylight.
Página 161 - Hence we may compute that the shining or burning matter must be above three miles in diameter. It is of an irregular round figure, and very sharply defined on the edges. The other two...
Página 160 - April 19, 10h 36", sidereal time. I perceive (says he) three volcanoes in different places of the dark part of the new moon. Two of them are either already nearly extinct, or otherwise in a state of going to break out; which perhaps may be decided next lunation. The third shows an actual eruption of fire or luminous matter.
Página 157 - ... spring from their rugged flanks, and threatening the valleys below, seem to bid defiance to the laws of gravitation. Around the base of these frightful eminences, are strewed numerous loose and unconnected fragments, which time seems to have detached from their parent mass ; and when we examine the rents and ravines which accompany the over-hanging cliffs, we expect every moment that they are to be torn from their base, and that the process of destructive separation which we had only contemplated...
Página 99 - The common names, or meaning of these words, in the same order, are, the Ram, the Bull, the Twins, the Crab, the Lion, the Virgin, the Scales, the Scorpion, the Archer, the Goat, the Waterer, and the Fishes. Fig. 183. The 12 signs of the zodiac, together with the sun, and the earth revolving around him, are represented at fig.
Página 41 - The same astronomer also ascertained, that the squares of the times of revolution of the different planets are in proportion to the cubes of their mean distances from the sun.
Página 132 - The space between the Tropic of Cancer and the Arctic Circle is called the North Temperate Zone, and that between the Tropic of Capricorn and the Antarctic Circle is the South Temperate Zone.
Página 236 - Those which appear largest, are called stars of the first magnitude ; the next to them in lustre, stars of the second magnitude ; and so on to the sixth, which are the smallest that are visible to the bare eye.
Página 161 - The other two volcanoes are much farther towards the centre of the moon, and resemble large, pretty faint nebulae, that are gradually much brighter in the middle ; but no well defined luminous spot can be discerned in them. These three spots are plainly to be distinguished from the rest of the marks upon the moon ; for the reflection of the sun's rays from the earth is, in its present situation, sufficiently bright, with a...