Aequinoctium!

BTW… in the North, which is where most of you readers are, it is the first day of Spring, the Vernal Equinox, today.  We are interested in this day especially because we date Easter as the first Sunday after the first full Moon on or after the Vernal Equinox.

 

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About Fr. John Zuhlsdorf

Fr. Z is the guy who runs this blog. o{]:¬)
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9 Responses to Aequinoctium!

  1. Faith says:

    I was told today that I could balance an egg on the ground at the exact time of the Vernal Equinox. Of course, I was told that when I had no egg handy.
    What do you think?

  2. Arcgap says:

    that the egg would balance the same as it would any other day actually….

  3. guans says:

    Here’s another explanatory picture of the cause of the seasons.
    http://www.glyphweb.com/esky/concepts/vernalequinox.html

    Hope and pray for an agreed date for Easter to be celebrated between the East and West.

  4. Gratias says:

    Thank you Guans. I learned from your link that: “The equinox is the point where one season turns to the other. The word is Latin for ‘equal night’ and refers to the fact that, on the equinox, day and night are of equal length. There are two equinoxes each year, with the vernal equinox usually occurring on 21 March. Vernal comes originally from the Latin word for ‘bloom’ – it refers to the fact that, in the northern hemisphere, this equinox marks the end of winter and the beginning of spring”

  5. Mariana2 says:

    Of course it started snowing again here…

  6. Tim says:

    Actually, the astronomical definition of an equinox, despite the word’s Latin roots, is not that day and night are equal in length. Rather, the equinox is when the geometric center of the Sun’s disk crosses the equator. On an equinox, day is longer than night because sunrise is measured by the appearance at the horizon of the top of the disk of the sun, sunset by the disappearance of the bottom. This measure varies some by latitude. In Washington DC, where I am, we enjoyed twelve hours and seven minutes of daylight on 3/20/2014. The closest we came to “equilux” (as twelve hours of day and night is called) this spring in DC was on 3/17. Astronomical twilight complicates the story even more. For the technically minded, here’s a fuller explanation: http://darkskydiary.wordpress.com/2010/03/20/equinox-equilux-and-twilight-times/

  7. LarryW2LJ says:

    Arcgap has it right – the Vernal Equinox/Egg thing is a myth.

    http://urbanlegends.about.com/od/errata/a/equinox_eggs.htm

  8. sirlouis says:

    Yeah, but …

    Easter won’t in all years fall on the first Sunday after the first full moon after the astronomical vernal equinox. Calculation of the date of Easter is a good deal more complex. The date is linked not to the astronomical full moon but to the ecclesiastical full moon, and not to the astronomical equinox, but simply to March 20th. Since the Council of Nicaea, for the purpose of calculating the date of Easter the Church has fixed the vernal equinox as occurring on that date. It is, as I say, a little complex.

  9. JoseTomas says:

    Father Z, you should see this: HERE

    Seems we nearly missed TEOTWAWKI a while ago.

    [One of these days it will hit us full on. I wonder how many readers here will then remember my posts about readiness.]