Equinox

Yesterday (March 20) was the equinox (spring or vernal in the Northern Hemisphere), the day the sun is directly over the equator. If you were on the equator, at noon, the sun would be in the highest possible point in the sky, directly overhead. (Aside: Here’s a fun and somewhat technical post about where the sun rises and sets at the equator, Hawaii, and the Arctic Circle.)

At the equinox, here in Chicago, at local noon, the sun is slightly higher than halfway between the horizon and the point directly overhead (about 48 degrees above the horizon). Over the next few days, the sun will rise almost directly east and will set almost directly west, perfectly aligned with the street grid, a.k.a. Chicago-henge.

The height of the sun at noon on the equinox (and solstices) in Chicago.
The height of the sun at noon on the equinox (and solstices) in Chicago.
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