This is the sun setting over Lake Michigan from a spot on the west coast of the lower peninsula—between Pentwater and the Little Sable Point Lighthouse.
I've heard about, and was anticipating, the green flash, which appears just as the sun ducks behind the horizon.
I did see a green blob appear, but (having done no research on it) believe it simply to be an afterimage of the sun when it finally dips below the horizon. The rods and cones in one's eyes become fatigued with prolonged viewing; when one shifts focus (or removes the sun here), an afterimage appears—which shows in the opposite color, green in this case.
Update: @skylobster tells me that the green flash is real, that they have witnessed it. With just a little digging I did find some photographs of it, such as on this site.
That site also directly addresses, and debunks, my hypothesis...
"Another common misconception is that a green flash is an afterimage, a result of the saturation of the red cones in the human retina or that it was an enduring image that remained after the sun had set. But sightings of the green flash at sunrise made both of these ideas implausible."
One might ask if I ever get tired of being wrong. Five images by Richard Koenig; taken July 6th 2023.
This is my favorite beach to visit. Settled on the Western coast of Michigan, Saugatuck. It's pretty lowkey, and even on days with lots of visitors, it doesn't feel packed. Beautiful rolling dunes (not pictured) and trails can be found here as well!
Frozen Chicago. View from the Museum Campus. #Chicago #LakeMichigan #ChicagoWinter #ChicagoSkyline #Winter https://www.instagram.com/p/CoP0T7zOaHR/?igshid=NGJjMDIxMWI=
Morning view on the bike path between Addison and Fullerton No. 2 #chicago #lincolnpark #bikepath #lakemichigan #iphonephotography #iphonography (at Lincoln Park, Chicago) https://www.instagram.com/p/Cn64jhNLw7u/?igshid=NGJjMDIxMWI=
The green flash: since seeing it last year (but not shooting it ‘cause I was not expecting it), I tried many times to photograph it in the following months. I made several trips over to the west side of Michigan but was thwarted by smoke from Canadian wildfires and/or clouds near the horizon line—every time. The green flash, in effect, became my white whale.
Recently, I heard about a comet, Pons-Brooks, and wanted to try to shoot that as I'd gotten a decent shot of Neowise several years ago. Going over to Lake Michigan would give me the best view to the west as it would be low toward the horizon. Then it hit me, if it’s totally clear at St. Joseph, I might as well try for the green flash prior to it getting dark for the comet.
While not an outstanding result, I'll take this given my earlier, fruitless attempts. By the way, the comet was a dud: a fuzz ball with no tail that I could discern, alas.
Four images by Richard Koenig; taken April 5th 2024.