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September 22
In 2011, the Autumnal Equinox begins on September 23rd.
The Fall Equinox of 2014 is on Tuesday, September 23. It will be at 10:29 PM Eastern Standard Time. This is when the day and night are equal.
The vernal equinox is in March in the northern hemisphere and in September in the southern hemisphere.
The first date of the spring equinox is March 20th
Subsolar PointBy definition, the subsolar point is the point on the Earth's surface at which the Sun is at its highest (or lowest) latitude at local solar noon. The Subsolar point changes continually as the Earth rotates and seasonally moving from 23.5 degrees South to 23.5 degrees North (the solstices) and back throughout the year. To the extent that the subsolar point is directly beneath the sun (i.e., when the sun's rays are exactly perpendicular to the Earth's surface), it would also be true that the closest point on Earth to the sun at that particular point in time would be the subsolar point.
The Subsolar Point is the shortest distance between the Earth and Sun. The distance constantly changes, because of orbits, drifts, shifts, tilts, etc. However, by definition, the subsolar point is the point on the Earth's surface where the Sun is at its highest (or lowest) latitude at local solar noon. Subsolar points change daily moving from 23.5° South to 23.5° North (the solstices) and back throughout the year. To the extent that the subsolar point is directly beneath the sun (i.e., when the sun's rays are exactly perpendicular to the Earth's surface), it would also be true that the closest point on Earth to the sun at that particular point in time would be the subsolar point. NOTE: The shortest distance between two bodies forms a perpendicular line between the closest parallel planes of both bodies. Subsolar point is the term used to identify the point on a planet which is closest to the sun at any given moment.
The "autumnal equinox" is a single point in time, not a period. In 2015, the autumnal equinox will happen at 08:20 (UT) on the 23rd September.
No. The "sub-solar" point is that point on the Earth where the Sun is STRAIGHT UP from there.
The subsolar point.
March equinox and September equinox : Daylight and darkness are of equal length on both the Vernal Point (Spring/March 20th 2011) and the Autumnal Point (Autumn/September 23rd 2011) .
The September equinox can occur at any time from the 21st to the 24th of September.
No. September has an equinox.
The fall equinox occurs in September in the Northern Hemisphere.
The spring equinox is March 21, The fall equinox is September 23
September 22
tropic of cancer and tropic of capricon