Kristen's Classroom: Autumnal Equinox

AUSTIN (KXAN) - Despite the ongoing summer heat, we officially flip the calendar to fall on Sunday, September 22nd at 7:44 a.m. Central Daylight time.On the Autumnal Equinox, the sun is positioned right over the Earth's equator, allowing equal amounts of daylight to both the Northern and Southern Hemisphere. But why does the first day of autumn not fall on the same day every year? RELATED: The fall foliage season in Central Texas is on the wayWhy does the date of the Autumnal Equinox change?The