I hope Chicago has decent weather for the full moon 11 days from now:
It's coming Sept. 27 at 9:47 p.m. CDT.
For starters, it is what some astronomy enthusiasts call a "super" moon because it will occur when the moon is close to perigee, its nearest point to Earth in its elliptical orbit.
The moon reaches perigee Sept. 28, and it will be just more than 222,000 miles away at the time of the full moon. That is about 31,000 miles closer than lunar apogee, the moon's farthest point in its orbit.
The moon appears about 14 percent bigger and 30 percent brighter at perigee than it does at apogee, according to NASA. But it doesn't look dramatically different to the naked eye.
The full moon also comes with a full lunar eclipse, all of which will be visible from the eastern half of the United States, including Chicago. Such eclipses can give the moon a reddish tint, caused by light bending through Earth's atmosphere.
Here's the official NASA page showing just how disappointed we'll be if it's cloudy in Chicago.