 | Mormons - 1913 - 968 pages
...correspondent on this page. Why is December 21 our shortest day in the year? — An enquirer. In going around the sun, the axis of the earth is not perpendicular to the plane of the liptic. but is slanted at an angle of 66l/2 degrees on one side and 23'/i on the other, so that... | |
 | Aeronautics - 1976 - 44 pages
...to the Martian surface. A Mars year consists of 670 Sols, ie 687 Earth days. Mars' axis, like that of the Earth, is not perpendicular to the plane of its orbit. lt is tilted 25 degress compared with Earth's axial tilt of 231/z degrees. So Mars, too, experiences... | |
 | 290 pages
...Earth's orbit is not in the same plane as the orbits of the other planets. CD The axis of rotation of the Earth is not perpendicular to the plane of its orbit but instead is tilted at an angle. Table 1.7 Sample Question 7 Results (Multiple-Choice) Overall percentage... | |
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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. 
