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Equinox


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Posted
  • Location: Coleraine,Macosquin,County Londonderry, Northern Ireland
  • Location: Coleraine,Macosquin,County Londonderry, Northern Ireland

can someone explain what equinox is

When it officially becomes autumn or spring etc. It is usually worked out by the numbers of sunlight hours or the sun angle like on this one everywhere in the world on that day will have 12 hours of daylight and 12 hours of night.

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Posted
  • Location: Beccles, Suffolk.
  • Weather Preferences: Thunder, snow, heat, sunshine...
  • Location: Beccles, Suffolk.

I think it is the point in time at which the Sun's 'overheadness' crosses from the Northern to the Southern hemisphere, and vice verca?

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Posted
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)
  • Weather Preferences: Sunshine and 15-25c
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)

yeah its when the sun crosses the equator and heads south for the winter or heads north for the spring

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Posted
  • Location: Whaley Bridge - Peak District
  • Location: Whaley Bridge - Peak District

To make it a bit easier to understand.

23 Sep 2010

(Sunrise) 06:56

(Sunset)19:06

(Length of day)12h 09m 26s

(Time of daylight losing until Dec 21st) − 4m 12s

Or to put it into context, break the Calendar down into half first. You have Midwinter where daylight is at its shortest and night is at its longest. Then you have Midsummer 6 months later, as theres 12 months in a year) where daylight is at its longest and night is at its shortest.

Between these 2 Mid-Sols there are Equinoxes, where the transition from the short and long daylight have to counterbalance each other out. This is when Day and Night become equal in the 1/4 Calendar or Equinoxes. This happens in March (20th/21st) and September (22nd/23rd) of every year also.

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Posted
  • Location: Bangor, Northern Ireland (20m asl, near coast)
  • Weather Preferences: Any weather will do.
  • Location: Bangor, Northern Ireland (20m asl, near coast)

yep, equi = equal and nox = night.

So equal night.

Other than that, the explanation of its other terms has been answered above.

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Posted
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)
  • Weather Preferences: Sunshine and 15-25c
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)

...lets get this last warmth out the way and then by friday i can watch the forecasts with interest

why what is happening on friday?

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Posted
  • Location: Putney, SW London. A miserable 14m asl....but nevertheless the lucky recipient of c 20cm of snow in 12 hours 1-2 Feb 2009!
  • Location: Putney, SW London. A miserable 14m asl....but nevertheless the lucky recipient of c 20cm of snow in 12 hours 1-2 Feb 2009!

Should be some good tidal bores manifesting themselves...

Are those like Climate Change bores? Must be a thread I've missed over in 'Climate And Environment'..... :winky:

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Posted
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)
  • Weather Preferences: Sunshine and 15-25c
  • Location: Edmonton Alberta(via Chelmsford, Exeter & Calgary)

It's officially autumn, 04:09 BST this morning!

Autumn started three weeks ago on Sept 1st :fool:

Edited by cheeky_monkey
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Posted
  • Location: Camborne
  • Location: Camborne

I think it is the point in time at which the Sun's 'overheadness' crosses from the Northern to the Southern hemisphere, and vice verca?

More or less. It's when sun moves southward across the celestial equator and fall begins in the NH. If you are in the States of course.:D

Just in case, the celestial equator divides the sky into southern and northern hemispheres, just as the earth's equator divides the earth into two hemispheres.

Oops, sorry if this has already been answered.:fool:

Edited by weather ship
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Posted
  • Location: South Yorkshire
  • Location: South Yorkshire

More or less. It's when sun moves southward across the celestial equator and fall begins in the NH. If you are in the States of course.:cray:

Just in case, the celestial equator divides the sky into southern and northern hemispheres, just as the earth's equator divides the earth into two hemispheres.

Oops, sorry if this has already been answered.:hi:

Like this!

http://imagery.weath...utc_800x600.jpg

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