Can You Balance Eggs on End During the Spring Equinox? As the angle of the earth's inclination toward the sun changes throughout the year, lengthening or shortening the days according to season and hemisphere, there are two times annually when day and night are of more-or-less equal length: the spring and autumnal equinoxes. These celestial tipping points have been observed for thousands of years.
The ecliptic and celestial equator intersect at the spring and autumn equinox points. The ecliptic represents the sun's apparent yearly path in front of the constellations of the Zodiac. The celestial equator is simply a circle drawn around the sky, above Earth's equator.