Happy Equinox!
Today is the Autumnal equinox. That means several things:
1. There will be 12 daylight hours, followed by 12 hours of darkness. (The word "equinox" is derived from the Latin aequi- ‘equal’ + nox, noct- ‘night.’)
2. The sun rises due east and sets due west. You can see this if you stand on an east/west street at sunrise or sunset.
3. Some people would say that today is the first day of Autumn, but here in LA it still feels like Summer.
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I have always found these shifts to be fascinating. We rotate around the sun, and things change.......in an orderly predictable fashion, no less.
Fascinating!
I find it fascinating, too.
That's partly why I became a physicist.
Best time of year!
where the summer is hot and humid, and the winters are freezing. Washington DC is such a place, although the week or two of spring is also very nice in DC. 
Here in LA we don't really have seasons.
However, the center of the solar disk will be above/below the horizon for 12/12 on the equinox... 
It's true that the finite size of the solar disk extends the hours of daylight. But that's not the whole story.
The bending of sunlight by the atmosphere (atmospheric refraction) also extends the hours of daylight.
BTW, the rising or setting sun often appears flattened, because atmospheric refraction is greater at the bottom than at the top of the disk.
