Happy AutumnSeptember 22nd, 2013 at 1:20 am by Bill Steffen under Bill's Blog, Weather
<–Petosky (from Sharon Witters on ReportIt. Today is the first day of astronomical Autumn. Fall officially arrives today at 4:44 PM EDT. On the Autumn Equinox, the sun is directly overhead at solar noon over a line we call the Equator, which divides the Northern and Southern Hemispheres. The word “Equinox” means “equal night” and every point on the globe has roughly 12 hours of daylight and 12 hours of nighttime (well, twilight and nighttime). Now, if you see the sunrise and sunset times for today, they don’t quite come out to 12 hours even. That’s because of two things. We don’t measure sunrise and sunset from the middle of the sun. Sunrise occurs when the first tip of the sun comes up over a totally flat horizon. Sunset is when the last tip of the sun disappears over a totally flat horizon. Also, light bends a tiny bit as it enters the Earth’s atmosphere. So, we gain a couple minutes that way. An overall cool pattern continues today, but warmer weather will send temps. to 75-80 later this week.