Last week it happened............

Equinox means equal night. The first official day of autumn, the autumnal equinox, occurs on Sept. 22 or 23 in the Northern Hemisphere. This year it was Thursday at 5:23 when the sun reached the celestial equator, an imaginary line through the sky above the Earth's equator. As the sun's center crossed the line, the season officially changed to autumn. So for the next three months, nights in the Northern Hemisphere will continue to grow longer than 12 hours and days to grow shorter.