Happy Autumnal Equinox!


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Freakzilla
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Happy Autumnal Equinox!

Post by Freakzilla »

In the language of science, an equinox is either of two points on the celestial sphere where the ecliptic and the celestial equator intersect. For the rest of us, it's one of two times a year when the Sun crosses the equator, and the day and night are of approximately equal length.

At the autumnal equinox (Sept. 22, 2010, 11:09 P.M.), the Sun appears to cross the celestial equator, from north to south; this marks the beginning of autumn in the Northern Hemisphere.

The vernal equinox, also known as “the first point of Aries,” is the point at which the Sun appears to cross the celestial equator from south to north. This occurs about March 21, marking the beginning of spring in the Northern Hemisphere.

On the date of either equinox, the Sun is above the equator and night and day are of approximately equal length; the word equinox is often used to refer to either of these dates.


The equinoxes are not fixed points on the celestial sphere but move westward along the ecliptic, passing through all the constellations of the zodiac in 26,000 years. This motion is called the precession of the equinoxes. The vernal equinox is a reference point in the equatorial coordinate system.
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Eyes High
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Re: Happy Autumnal Equinox!

Post by Eyes High »

Happy belated one. The moon was beautiful last night I noticed that. Yeah! Fall is here. Three cheers for Autumn in the South. :dance: :dance: :dance:
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Freakzilla
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Re: Happy Autumnal Equinox!

Post by Freakzilla »

I'm tired of sweating. :cry:
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chanilover
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Re: Happy Autumnal Equinox!

Post by chanilover »

Happy equinox! The weather here is great, really sunny and warm.
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Robspierre
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Re: Happy Autumnal Equinox!

Post by Robspierre »

chanilover wrote:Happy equinox! The weather here is great, really sunny and warm.
Strange, down in the desert it's been overcast, grey, and raining :shock:

Rob
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Re: Happy Autumnal Equinox!

Post by D Pope »

Woo Hoo!
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Aquila ka-Hecate
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Re: Happy Autumnal Equinox!

Post by Aquila ka-Hecate »

Happy Vernal Equinox!

That's the middle of Spring, not the start of it.

That is, if you consider the Solticial points to be mid winter and mid summer - and I do, bugger what some NASA dude has to say.
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Re: Happy Autumnal Equinox!

Post by SandRider »

I'm not 100% sure of this, don't really remember how that works and what Freak posted just confused me,
but I'm thinking that if you've planted your solstice markers correctly, sunrise and sunset should mark (geographical)
due east & west ...






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Re: Happy Autumnal Equinox!

Post by merkin muffley »

Happy Mid-Autumn Festival.

And nice shot!
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