This is not a short answer question. I will provide the equinox and the solstice article below so you can get your answer straight in the related links box below.
north and south
The longest day of the year is the Summer Solstice, which normally happens on June 21 in the northern hemisphere and December 21 in the southern hemisphere. These dates can vary a day either way, depending on the cycle of leap years. Check the link below to see a list of solstices and equinoxes from the US Naval Observatory's web site "Earth's Seasons".
Equinoxes are when there are twelve hours of daylight and 12 hours of darkness. The autumnal equinox is on September 21st on average, and the vernal equinox is on March 21st on average. You can tell that the seasons have changed and the equinoxes and solstices have occured because the amount of sunlight changes and temperatures also change. Solstices are when there is either the shortest or longest amount of daylight. The summer solstice is when there is the longest amount of daylight. After the summer solstice, days begin to slowly get shorter until the autumnal equinox. The winter solstice is when there is the shortest amount of daylight. After the winter solstice the days get longer until you reach the vernal equinox.
On the equinoxes day and night are of equal duration. On the solstices the difference between day and night are their maximum (longest day for summer solstice ... shortest day for winter).
The two equinoxes occur every spring and autumn. The "equinoxes" are two points on the map of the stars. The center of the sun reaches and passes one of them at some moment around March 21, and the other one at some moment around September 22. At those moments, the sun is directly overhead some point on the earth's equator, and every place on earth has roughly equal periods of sun-up and sun-down on that day ... the only two times in the year when these things happen.
equinoxes
No, the solstices and equinoxes mark the beginnings of the four seasons.
The equinoxes and solstices are the first days of seasons. On the equinoxes, night and day is the same length. On the solstices, the day is either the longest or the shortest day of the year, depending on which solstice it is and which hemisphere you are in,
91 and a fraction days. The dividing points are the two solstices and two equinoxes. You can see the precise dates of the equinoxes and solstices on the "Earth's Seasons" web site at the US Naval Observatory, at the link below.
Yes, the date of each of the equinoxes and each of the solstices varies from year to year due to the differences between a calendar year (365 or 366 days) and an average actual year (about 365.24219878 days). The dates of the solstices and equinoxes also vary depending on where you are on earth, since there are always at least two days in progress on earth at any given time.
The solstices are generally on June 21 and December 21; the equinoxes are usually on March 21 and September 21. These dates can vary a day or two either way, depending on the cycle of leap years. The U.S. Naval Observatory publishes a web page called "Earth's Seasons" which lists the dates and times of the solstices and equinoxes for each year, down to the minute. See the link below.
The two equinoxes.
The solstices are generally on June 21 and December 21 each year, but these dates can vary a day either way depending on the cycle of leap years. You can see the precise time of the solstices and equinoxes each year on the U.S. Naval Observatory's web page "Earth's Seasons", at the link below.
Yes. If we did not insert the leap day during leap year, the calendar date of the equinoxes and solstices would change and eventually come at very different times in the calendar year. The whole purpose of Leap Year/Leap Day is to keep our calendar aligned with the equinoxes, solstices, and seasons in general.
The Earth's tilt results in the solstices and euinoxes, depending on where the Earth is in it's orbit around the sun.
" seasons are the manifestation of solsticesand equinoxesand are markers of the seasons
There are two solstices and two equinoxes so the answer is 8.