 | William Lawson (F.R.G.S.) - Geography - 1864 - 104 pages
...for sometimes it is 23£° north, and at other times 23y south of it. The reason of this is, that, in moving round the sun, the axis of the earth is not perpendicular to the plane of its orbit, but makes with it an angle of 66^°. This inclination of the earth's axis is the cause of the seasons.... | |
 | William Thomas Brande - Encyclopedias and dictionaries - 1866 - 968 pages
...the length of the natural days. These two last phenomena depend on two circumstances : first, that the axis of the earth is not perpendicular to the plane of the ecliptic, or the plane in which the annual revolution is performed ; and second, that the extremities... | |
 | William Thomas Brande, George William Cox - Science - 1866 - 972 pages
...commodious manner, mathematicians refer them to two gnat last phenomena depend on two circumsta first, that the axis of the earth is not perpendicular to the plane of the ecliptic, or t he plane in which the annual revolution is performed ; circles; that is to say,... | |
 | William Hughes - Physical geography - 1868 - 346 pages
...of the differences of heat and cold, of shorter or longer days and nights, is found in the fact that the axis of the Earth is not perpendicular to the plane of its annual motion, but is inclined to that plane at an angle of (if;^ 0 , (or, more strictly, 66° 32'.)... | |
 | William Latham Bevan - Geography - 1869 - 698 pages
...without taking into consideration the position, or rather the posture, of the earth in reference to the sun. The axis of the earth is not perpendicular to the plane of its orbit, but inclined towardi it at an angle of about 23^ degrees (exactly 23° 27' 28-75"), as shown in Fig.... | |
 | Ellen Eliza Fitz - Globes - 1876 - 138 pages
...moves from east to west across the sky, while the earth rotates upon its axis from west to east. 64. The axis of the earth is not perpendicular to the plane of its orbit, or plane of the ecliptic, but is inclined towards it 23^° ; that is, the axis makes an angle of 23^°... | |
 | Ellen Eliza Fitz - Globes - 1876 - 138 pages
...moves from east to west across the sky, while the earth rotates upon its axis from west to east. 64. The axis of the earth is not perpendicular to the plane of its orbit, or plane of the ecliptic, but is inclined towards it 23^° ; that is, the axis makes an angle of 23^°... | |
 | Sydney Barber Josiah Skertchly - Physical geography - 1878 - 248 pages
...Uranus. 8. Neptune. Of these the first four are called interior planets, the rest exterior planets. The axis of the earth is not perpendicular to the plane of its orbit, but is inclined to it at an angle of 23° 28'. 2 Another very important point to remember is that,... | |
 | Samuel Maunder - Encyclopedias and dictionaries - 1880 - 904 pages
...circle of stars In the heavens, through which the earth would appear to move, if It were seen from the sun. The axis of the earth Is not perpendicular to the plane of the ecllp I tic, but declines from that perpendicular ' 23» 27' 56". [See EARTH.] The ecliptic ob-... | |
 | Geography - 1883 - 132 pages
...sun. 33. The Plane of the Ecliptic is the plane extending from the sun through the earth's orbit. 34. The axis of the earth is not perpendicular to the plane of the ecliptic. It makes an angle of 23^° with a perpendicular to that plane. This angle determines... | |
| |
We shall now explain the variation of the seasons, and the difference of the length of the days and nights in those seasons — both effects resulting from the same cause. 
