Gosh, do you suppose it's still there?
The links referenced above (on the Artsnet Minnesota website) seem to indicate that the large version of the sundial was part of the 1939 New York World's Fair.
The fair was built in Flushing Meadow Park in the borough of Queens, so it's logical that the Queens Museum of Art would be credited.
But most of the fair's exhibits were only built to be temporary; the sundial looks like marble, but probably was only plaster over a framework (if you look carefully at the gnomon, you can see the seams.) So, it wouldn't surprise me if it had been torn down as soon as the fair was over.
So, you've got a very cool artifact image here, showing an unusual artwork from a famous event of the "classical rangefinder period"!
1939-40 World's Fair info