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Moon cakes* and Sunshine September 21, 2012

Posted by Geek 20/20 in News, Science.
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Every day my alarm goes off at 6.30. This week it’s been a struggle to get up as it no longer light at this time.

What does this mean? The autumnal equinox is tomorrow (14:49 Universal Time). It’s officially the first day of fall.

The website EarthSky.org gives this explanation

Because Earth doesn’t orbit upright, but is instead tilted on its axis by 23-and-a-half degrees, Earth’s Northern and Southern Hemispheres trade places in receiving the sun’s light and warmth most directly.  We have an equinox twice a year – spring and fall – when the tilt of the Earth’s axis and Earth’s orbit around the sun combine in such a way that the axis is inclined neither away from nor toward the sun. 

Earth’s two hemispheres are receiving the sun’s rays equally now.  Night and day are approximately equal in length.  The name ‘equinox’ comes from the Latin aequus (equal) and nox (night).

As the leaves change colour and the final days of harvest draw near. I hope you enjoy the delights of this season.

*In China during the equinox, moon cakes are shared hence the title.

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