It's time again for Chicagohenge

Saturday marks the autumnal equinox, when day and night are equally long and local photographers geek out over the semiannual Chicagohenge.

How it works: On spring and fall equinox days, the sun shoots straight east or west during sunrise and sunset, making for striking pictures down our perfectly gridded streets.

Be smart: The best times to catch the magic will be tomorrow at sunrise and sunset (around 6:30am and 6:30pm) downtown on Kinzie, Randolph, Madison and Washington near Millennium Park.

The intrigue: On this side of the lake, we all know the best place to watch the sunrise — that is if you get up and get yourself to the water on time.

• But we're looking for suggestions for places to watch the sun set.

Email us to share where you like to watch the sun set locally.