Influence On The Earth
Because of the axial tilt of the Earth (often known as the obliquity of the ecliptic), the inclination of the Sun's trajectory in the sky (as seen by an observer on Earth's surface) varies over the course of the year. For an observer at a northern latitude, when the northern pole is tilted toward the Sun the day lasts longer and the Sun climbs higher in the sky. This results in warmer average temperatures from the increase in solar radiation reaching the surface. When the northern pole is tilted away from the Sun, the reverse is true and the climate is generally cooler. Above the arctic circle, an extreme case is reached where there is no daylight at all for part of the year. (This is called a polar night.) This variation in the climate (because of the direction of the Earth's axial tilt) results in the seasons.
Read more about this topic: Earth's Orbit
Famous quotes containing the words influence and/or earth:
“My administration is pledged to follow the policies of Mr. Roosevelt in this regard, and while that pledge does not involve me in any obligation to carry them out unless I have Congressional authority to do so, it does require that I take every step and exert every legislative influence upon Congress to enact the legislation which shall best subserve the purposes indicated.”
—William Howard Taft (1857–1930)
“One generation passeth away, and another generation cometh: but the earth abideth for ever. The sun also ariseth, and the sun goeth down, and hasteth to the place where he arose.”
—Bible: Hebrew Ecclesiastes 1:4,5.
Ernest Hemingway’s book title The Sun Also Rises (1926)