Chicagohenge 2019: When To Get The Best View

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CHICAGO (CBS) -- Twice a year Chicagoans take to the streets to get a shot of a spectacle that comes only twice a year -- Chicagohenge.

Every year around the spring and fall equinoxes, around March 21 and September 21, the sun lines up for a perfect photo between the city's buildings on the east-west streets in the grid at sunrise and sunset.

People line the street to take photos of the sunset on Sept. 20 as Chicagohenge nears. (Credit: John Dodge/CBS 2)

This year's fall equinox is Monday, Sept. 23.

The area could be affected by very heavy rain Sunday morning and Sunday night, according to CBS 2 meteorologist Robb Ellis, which might not make for the best time to see the phenomenon. Monday will be better as the rain clears out.