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#11
June 29th 07, 02:39 PM
posted to rec.radio.shortwave
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(OT) Thick Layer Of Magma Found Under American Southwest.
"Brenda Ann" wrote in message news  "HFguy" wrote in message news:uv1hi.10571$9b5.1632@trndny05... Earth is closer to the Sun in Winter and further away from the Sun in Summer. This is true only for the northern hemisphere and it's not what causes the seasons. The Earth reaches perihelion - the point in its orbit closest to the Sun - in early January, only about two weeks after the December solstice. Thus winter begins in the northern hemisphere at about the time that the Earth is nearest the Sun. Is this important? Is there a reason why the times of solstice and perihelion are so close? It turns out that the proximity of the two dates is a coincidence of the particular century we live in. The date of perihelion does not remain fixed, but, over very long periods of time, slowly regresses (moves later) within the year. There is some evidence that this long-term change in the date of perihelion influences the Earth's climate. My bad, forgot the link/cite: http://aa.usno.navy.mil/faq/docs/seasons_orbit.html |
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