Chart of the Day: Minnesota Daily Insolation on September 1st

Insolation is a portmanteau of Incoming Solar Radiation, or how much energy we are receiving on per day from the sun (measured in watts per meter squared). This changes based on the tilt of the earth, which in turn affects both the total duration and angle of sunlight. The patterns change a lot depending on the specific latitude, and the Twin Cities is located at about 45º N.  Here’s where we sit today, on a chart showing insolation patterns at four different latutides:


(To imagine the Twin Cities insolation pattern, picture a line half-way between the red and green lines.)

We’re entering the period of greatest change as we move toward the equinox. Get outside, go for a walk or ride your bike*, and enjoy the sunshine while it lasts!


* Denotes tenuous connection to transportation

Bill Lindeke

About Bill Lindeke

Pronouns: he/him

Bill Lindeke has writing blogging about sidewalks and cities since 2005, ever since he read Jane Jacobs. He is a lecturer in Urban Studies at the University of Minnesota Geography Department, the Cityscape columnist at Minnpost, and has written multiple books on local urban history. He was born in Minneapolis, but has spent most of his time in St Paul. Check out Twitter @BillLindeke or on Facebook.