… all things being equal… [Fr. Z]

From Astronomy Pic of the Day:

Today is an equinox, a date when day and night are equal. Tomorrow, and every day until the next equinox, the night will be longer than the day in Earth’s northern hemisphere, and the day will be longer than the night in Earth’s southern hemisphere. An equinox occurs midway between the two solstices, when the days and nights are the least equal. The picture is a composite of hourly images taken of the Sun above Bursa, Turkey on key days from solstice to equinox to solstice. The bottom Sun band was taken during the winter solstice in 2007 December, when the Sun could not rise very high in the sky nor stay above the horizon very long. This lack of Sun caused winter. The top Sun band was taken during the summer solstice in 2008 June, when the Sun rose highest in the sky and stayed above the horizon for more than 12 hours. This abundance of Sun caused summer. The middle band was taken during the Vernal Equinox in 2008 March, but it is the same sun band that Earthlings will see today, the day of the Autumnal Equinox.

Full entry…

I posted this reply on his blog.

Umm… While I really like this photo, the article is not completely accurate. Nights grow longer between the Summer Solstice and the Winter Solstice. After that, the nights will grow longer until the Summer Solstice, on June 21. The the Autumnal and Vernal equinoxes mark the halfway point between the solstices and it is when the period of day and night are MOST equal.


I think he got it right - he just didn’t edit it for clarity.

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