VERNAL EQUINOX
Taking place in the Northern Hemispheric spring, it is the point at which the ecliptic intersects the celestial equator. Days and nights are most nearly equal in duration.
Vernal Equinox - the equinox when the sun approaches the Northern Hemisphere; typically called the first day of spring ...
For example, in the Northern Hemisphere, winter is said to begin on the winter solstice and end on the vernal equinox when spring begins, covering the months of December, January, and February.
winter - Astronomically, between the winter solstice and vernal equinox in the Northern Hemisphere, and the summer solstice and autumnal equinox in the Southern Hemisphere; the coldest season of the year; ...
For example, in the Northern Hemisphere, from the vernal equinox to the summer solstice is Spring (March 21 to June21). From that solstice to the autumnal equinox is Summer (June21-September 22).
March 1998: Vernal Equinox
April 1998: To Be A Stormwatcher
May 1998: They Call The Wind
June 1998: Comes The Rain And Thunder
July 1998: It's Not Just The Heat
August 1998: Weather in the Rockies
September 1998: Comes the Fall ...
SIDEREAL TIME The measure of time as defined by the diurnal motion of the vernal equinox. A sidereal day is equivalent to one complete rotation of the earth relative to the equinox, which is 23 hours, 56 minutes, and 4.091 seconds.
Tropical Year - The time measured from one vernal equinox to the next; that is, the apparent revolution of the sun through the zodiac, equal to 365.2422 mean solar days or 365 days, 5 hours, 48 minutes, 46 seconds.
the sun--that is, the time it takes the Earth (as seen from the sun) to reappear at the same fixed star, equal to 365.2564 mean solar days or 365 days, 6 hours, 9 minutes, 10 seconds. b) Tropical Year: The time measured from one vernal equinox to ...
The celestial longitude of the sun. This value is 0 at the vernal equinox, 90 at the summer solstice, 180 at the autumnal equinox and 270 at the winter solstice.
Right Entrance Region ...
Equinox: the time when the sun crosses the earth's equator, making night and day of approximately equal length all over the earth and occurring about March 21 (the spring or vernal equinox) and September 22 (autumnal equinox).
F ...
seasons are often considered to begin at the astronomical solstices and equinoxes: these are sometimes known as the "astronomical seasons". By this reckoning, summer begins at summer solstice, winter at winter solstice, spring at the vernal equinox ...
The days will begin to become longer until on March 20, the sun will be directly over the equator, (Vernal Equinox), at this time the day and nighttime hours are each 12 hours long through-out the world, ...
It is the interval between two consecutive returns of the sun to the vernal equinox. In 1900, that took 365 days, 5 hours, 48 minutes, and 46 seconds, and it is decreasing at the rate of 0.53 second per century.
Compare with vernal equinox, offset by six months.AvalancheA mass of snow, rock, and/or ice falling down a mountain or incline. In practice, it usually refers to the snow avalanche.
This value is 0 at the vernal equinox, 90 at the summer solstice, 180 at the autumnal equinox and 270 at the winter solstice.
 See also: Equinox, Earth, Weather, Water, Storm
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