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Four Seasons Of Earth Explained W/Pictures & Video
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Abracadabra Founding Member
Posts : 1325 Join date : 2010-05-13 Age : 81
Subject: Four Seasons Of Earth Explained W/Pictures & Video Mon 24 Dec 2012, 7:54 am
These diagrams, pictures and video show the reason for the fours season.....If you want a semi-scientific explanation...than click on the word spoiler below......
To me these pictures & video make the four seasons far easier to understand!
Spoiler:
SPRING EQUINOX SUMMER SOLSTICE FALL EQUINOX WINTER SOLSTICE
sol·stice 1. Either of two times of the year when the sun is at its greatest distance from the celestial equator. The summer solstice in the Northern Hemisphere occurs about June 21, when the sun is in the zenith at the tropic of Cancer; the winter solstice occurs about December 21, when the sun is over the tropic of Capricorn. The summer solstice is the longest day of the year and the winter solstice is the shortest.
e·qui·nox 1. Either of two points on the celestial sphere at which the ecliptic intersects the celestial equator. 2. Either of the two times during a year when the sun crosses the celestial equator and when the length of day and night are approximately equal; the vernal equinox or the autumnal equinox.
The start of winter—the winter solstice—is the shortest day of the year, when the Sun reaches its most southern point in the sky at local noon. After this date, the days start getting longer.
On the first day of spring—the vernal equinox—day and night are each approximately 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days before the vernal equinox). The Sun crosses the celestial equator going northward; it rises exactly due east and sets exactly due west.
The first day of [/b]summer—the summer solstice[/b]—is the longest day of the year, the Sun reaches its most northern point in the sky at local noon. After this date, the days start getting shorter.
On the first day of fall—the autumnal equinox—day and night are each about 12 hours long (with the actual time of equal day and night, in the Northern Hemisphere, occurring a few days after the autumnal equinox). The Sun crosses the celestial equator going southward; it rises exactly due east and sets exactly due west.
Image of solar radiation...showing why parts on the earth are warmer than other parts.
Video of solar radiation effect on the earth....below.... click on the word spoiler below to read the explanation of the video.....
Spoiler:
Below is a true-color computer animation of the surface changes of Earth during one year based on NASA Visible Earth imagery. The seasonal changes of ice and vegetation are clearly visible. The rotating globe animation shows the Sun-facing side of Earth as it rotates around the Sun (rotating only once per month for clarity). Earth appears to wobble in space exposing more the South Hemisphere early in the year (Northern Winter) and later the North Hemisphere during mid-year (Northern Summer). This is caused by the axial inclination of Earth of 23°and is the basis for seasonal changes of ice and vegetation.
Note: watch the snow/ice disappear and appear again.
Last edited by Abracadabra on Thu 03 Jan 2013, 11:52 am; edited 3 times in total (Reason for editing : changed some wording & spelling)
Four Seasons Of Earth Explained W/Pictures & Video
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