. Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere. 88 THE EAKTH. ian of Washington, or that which passes through Green-wich, near London, where the principal observatory ofEngland is situated; and the distance of the place fromthis First Meridian, as it is called, measured in degrees(or 360ths of its parallel), determines, with its latitude, itsexact position. Distance from the first meridian, so meas-ured, is called Longitude. Places east of the
. Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere. 88 THE EAKTH. ian of Washington, or that which passes through Green-wich, near London, where the principal observatory ofEngland is situated; and the distance of the place fromthis First Meridian, as it is called, measured in degrees(or 360ths of its parallel), determines, with its latitude, itsexact position. Distance from the first meridian, so meas-ured, is called Longitude. Places east of the first merid-ian are said to be in east longitude, and those west of thefirst meridian in west longitude. As the distance halfround the Earth is 180°, the greatest longitude a placecan have is 180°. -£.:FriV 4 latitude and meridians of longi-. ^icojfCancer^A tude laid d°WI1 10° 0Y 15° &Vart *[..-- i ..W Besides these, 23-J° from the ^\_^^^^r77^^jS equator on either side are the jvopic off Capricorn—:] Tropics,—the Tropic of Cancer ^X^jmt^^c^^y^ north of the equator, the Tropic of Capricorn south of it.™ o0 m n*lt ° ri At the same distance from Fig. 38.—The Polab Circles, teopics, and zones. the poles are the Polar Circles, the northern one being distinguished as the Arctic Circle,the southern as the Antarctic Circle. The tropics andpolar circles divide the Earths surface into five belts, orZones—one torrid, two temperate, and two frigid zones, asshown in Fig. 38. 171. Polar and Equatorial Diameter,—The distancealong the axis of rotation, from pole to pole, through theEarths centre, is shorter than the distance through theEarths centre from any point of the equator to the op- tude? What meridian is generally taken as the First Meridian? What is thedifference between East and West Longitude ? What is the
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectastronomy, bookyear18
