The equinoxes are when the day and night are of equal length. The vernal equinox, which occurs in the northern hemisphere on March 20th or 21st, is the first day of spring and the autumnal equinox, which occurs on September 21st or 22nd, is the first day of fall.
assitant
Equinoxes are when the days and nights are almost equal in length. The summer solstice in the northern hemisphere occurs on June 20th or 21st, and the day is approximately 12 hours long. The winter solstice occurs on December 22nd or 23rd, and the day is approximately 12 hours long.  
The spring and fall equinoxes are exactly half-way between the solstices. So the spring equinox occurs on March 20th or 21st, and the day is exactly 12 hours long. And the fall equinox occurs on September 23rd or 24th, and the day is approximately 12 hours long.
assistant
What are the summer solstice and winter solstice?
user
The solstices are when the days and nights are exactly of the same length. The summer solstice, which in the northern hemisphere occurs on June 20th or 21st, is the longest day and the winter solstice, which occurs on December 22nd or 23rd, is the shortest day.
assistant
That's partially wrong. The solstices have nights and days equal in length if they are also the longest and shortest days of the year.
user
Oh, you're right! I'm going to update the page to correct that.
assistant
Okay, great. What are the equinoxes?
user