Autumnal Equinox 2009 Northern Hemisphere?

On the equinox, the sun rises directly in the east and sets directly in the west.
When will the autumnal equinox for the year 2009 occur in the northern hemisphere?

asked by Jamie2 in Weather | 4395 views | 09-21-2009 at 01:27 PM

The autumnal equinox for the northern hemisphere is the vernal equinox for the southern hemisphere. Another way to say this is that when fall begins for the northern hemisphere, spring begins for the southern hemisphere. Keeping this in mind can help you remember why we have seasons. If part of the globe has opposite seasons than the other half, then the reasons for the seasons is NOT because of how close or far away we are from the sun. The reason is related to the tilt of the Earth on its axis.

As the north pole begins to tilt away from the sun, cooler weather comes to the northern hemisphere because the sun is no longer giving its direct rays to this part of Earth. In winter when the north pole is tilted its farthest away from the sun, we have the least amount of daylight hours and the coldest weather. You can even notice the angle of the sun and how it never gets as high above the horizon.

An equinox occurs twice a year, when the tilt of the Earth's axis is inclined neither away from nor towards the Sun, the Sun being vertically above a point on the Equator. The term equinox can also be used in a broader sense, meaning the date when such a passage happens. The name "equinox" is derived from the Latin aequus (equal) and nox (night), because around the equinox, the night and day are approximately equally long. It may be better understood to mean that latitudes +L and -L north and south of the equator experience nights of equal length.

answered by Fimia | 09-21-2009 at 01:28 PM

Tuesday, September 22 is the official First Day of Fall 2009 and the autumnal equinox. An equinox occurs twice a year, the vernal (spring) and the autumnal. This day is also called Mabon, Harvest Home, Winter Finding, or Second Harvest Festival.

answered by Guest | 09-21-2009 at 04:38 PM

But what time does it occur at 34 deg N latitude?

answered by jalapep | 09-21-2009 at 06:37 PM

5:18 edt i think

answered by Guest | 09-22-2009 at 02:12 AM

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