The vernal equinox is Saturday morning, marking the astronomical beginning of Spring, according to ABC7 Meteorologist Larry Mowry.
This is also the time of the Chicago-henge, where the sunrise and sunsets line up perfectly with the east-west grid of the city.
The twice-a-year treat can be seen in downtown Chicago this weekend.
You should be able to see Chicago-henge for the next few nights, but Friday's sunset and Saturday's sunrise are the best times to catch it.
RELATED: Chicago-henge: When and how to see the unique phenomena
The Spring Equinox falls anywhere between March 20 and March 23.
The Fall Equinox falls anywhere between September 20 and September 23.