when is summer equinox?

Question

how long is day/nightime during event, subsequent days?

Answer 1

There isn't a Summer EQUNOX. There is a SPRING Equinox, and an AUTUMN EQUINOX. The Summer SOLSTACE is June 21. It is the longest day of the year. The two EQUNOX days are days when there are EQUAL light and dark hours.

Answer 2

One of the two places in the sky where the ecliptic crosses the celestial equator; or one of the two times of the year when the Sun crosses these points. The ecliptic is the great circle across the sky that marks the mean path of the Sun; the celestial equator is the great circle that is an extension into the sky of the Earth's mean Equator.

* Spring equinox and autumn or fall equinox. These names can be used when one wants to relate the equinox to a season. The seasons of the northern hemisphere and southern hemisphere are opposites (the spring equinox of one hemisphere is the autumn equinox of the other) so these names can be ambiguous.
* March equinox and September equinox. An alternative to the previous set, but without the ambiguity for which hemisphere they are intended. These names are still not universal, however, as not all people on Earth use a solar based calendar where the equinoxes occur every year in the same month (they differ in the Jewish calendar, for example). The names are also not useful for other planets (Mars, for example), even though they have seasons.
* Vernal equinox and autumnal equinox. These names are direct derivatives of Latin (ver = spring, autumnus = autumn), and as such more apt to be found in writings. Although in principle they are subject to the same problem as the spring/autumn names, their use over the centuries has fixed them to the viewpoint of the northern hemisphere. As such the vernal equinox is the equinox where the Sun passes from south to north, and is a zeropoint in some celestial coordinate systems. The name of the other equinox is used less often.
* First point of Aries and first point of Libra. Alternative names for the previous set, but removing the problem that the vernal equinox may be dependent on a specific hemisphere. One disadvantage is that due to the precession of the equinoxes the astrological signs where these equinoxes are located, do not correspond any longer with the actual constellations.
* Pisces equinox and Virgo equinox. Names to indicate in which constellations the two equinoxes are currently located. These terms are rarely used.
* Northward equinox and southward equinox. Names referring to the motion of the Sun at the times of the equinoxes.

Answer 3

There is no summer equinox. There is a summer solstice (ca. June 21), and a winter solstice (ca. December 21). There is a vernal (spring) equinox (ca. March 21), and an autumnal equinox (ca. September 21). During the equinoxes, the day and night are of the same duration. After the vernal equinox, the days get longer and the nights get shorter. After the autumnal equinox, the nights get longer and the days get shorter.

Answer 4

This is no summer equinox.

An equinox is when the sun crosses the equator making the length of day & night equal (12 hours) all over the earth. This occurs two times -- once in the spring, once in the fall.

Answer 5

june 21.

Sun rise sets depends on where you are. Check the U.S. Naval Observatory webpage.

Answer 6

Longer then fall/winter/sping, I love it getting dark at 8:45 PM-9PM :)

Answer 7

June 21st. Depends strongly on your latitude.

Answer 8

around july 21 i think.