Friday, March 20, 2009

Spring is here...I think

Today is the first day of Spring. It certainly didn't feel like it this morning---it was a mere 22 degrees. But I guess I'll just have to take the word of the experts on this.

Do you know why the first day of spring arrives on varying dates (from March 19-21) in different years? This happens for two reasons: One - our year is not an even number of days; and two - the Earth's slightly non-circular orbit, plus the gravitational pull of the other planets, changes our planet's alignment to the sun from year to year.

In addition to this, according to a study last month, the Earth's seasons have shifted in the past 150 years or so. The hottest and coldest days of the years are now occurring approximately two days earlier. So why, then, was it so cold this morning?

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