Fall officially begins with the autumnal equinox Monday, which means one of Chicago's most iconic phenomena will return as sunrise and sunset aligns with the city's street grid.

"Chicagohenge" occurs twice a year, as the sun directly lines up with Chicago's east-west facing streets during the autumnal equinox and during the vernal equinox that marks the start of spring.

Chicago's grid system of streets lines up nearly perfectly with the cardinal east and west directions on a compass, according to Adler Planetarium. During an equinox, the sun rises and sets directly to the east and west, creating the "Chicagohenge" phenomenon.

According to scientists at the Adler Planetarium, this year’s “Chicagohenge” will be visible on from Sept. 19 through 22, with views at sunrise when facing to the

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