Elements of Astronomy1842 |
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Elements of Astronomy: Adapted for Use in Schools and Private Study (Classic ... Hugo Reid No preview available - 2018 |
Elements of Astronomy: Adapted for Use in Schools and Private Study (Classic ... Hugo Reid No preview available - 2017 |
Common terms and phrases
appears arctic circle astronomical atmosphere attractive force binary stars causes centre circumference comets constellation dark day and night direction earth's axis earth's orbit earth's surface ecliptic equal equator equinoctial equinoxes excentricity fixed stars following figure force of gravity furthest heat heavenly bodies heavens horizon hour-circle inclined Jupiter latitude leading stars less light luminous magnitude Mars mean distance Mercury meridian millions of miles minutes moon moon's nearer nearly north pole north pole-star northern hemisphere observed parallax parallel passing period perpendicular phenomena polar position projectile force proportion radius represent revolution round revolving right angles right ascension rotation rotatory motion round the earth round the sun satellites Saturn seen side sidereal sidereal day signs solar day solar system south pole sphere square straight line sun and planets sun's influence sun's rays supposed tangental telescope termed terminator tion tropic of Cancer Uranus variable stars Venus waters zodiac
Popular passages
Page 32 - d- 14 h> , when it suddenly begins to diminish in splendour, and in about 3^ hours is reduced to the fourth magnitude. It then begins again to increase, and in 3-J hours more is restored to its usual brightness, going through all its changes in 2 d - 20 h - 48
Page 32 - This star, named ALGOL, is usually visible as a star of the second magnitude, and such it continues for the space of 2 d- 14 h> , when it suddenly begins to diminish in splendour, and in about 3^ hours is reduced to the fourth magnitude. It then begins again to increase, and in
Page 29 - the Ram ; TAURUS, the Bull; GEMINI, the Twins ; CANCER, the Crab ; LEO, the Lion ; VIRGO, the Virgin ; LIBRA, the Balance ; SCORPIO, the Scorpion ; SAGITTARIUS, the Archer;
Page 57 - The squares of the periodic times* of the planets are in the same proportion as the cubes of their mean distances from the sun.
Page 12 - A straight line is said to be perpendicular to a plane, when it is perpendicular to every straight line drawn
Page 13 - A CIRCLE is a straight line drawn through the centre, and terminated both ways by the circumference.
Page 12 - The INCLINATION OF A STRAIGHT LINE TO A PLANE is the acute angle contained by that line and another straight line, drawn from the point
Page 54 - leaning towards the rock,—by bodies tending towards the earth on every side,—by the action of the moon in raising the waters of the ocean, and forming the tides,—by the mutual action of the sun, planets, and satellites,—and by the consideration that, as
Page 167 - Being a Popular Account of the Construction and Mode of Action of that Engine, as applied to RAISING WATER, MACHINERY, NAVIGATION, RAILWAYS, &c., with a Sketch of its HISTORY, and of the Laws of HEAT and PNEUMATICS.
Page 22 - the top is observed a cluster of stars disposed within the figure of a small bear, which is surrounded by a line separating it from the adjoining stars. The stars within that line form a constellation, termed URSA MINOR, or the Little