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Hyalophora cecropia
This picture was taken at night under a light which cast a green hue.
I looked up some images of a Cecropia Moth and I believe that's it. I remember it was the largest moths I had ever seen.
The green tinge makes it a little harder to be sure, but it looks like it has a red band near the base of the hindwing, which makes this a Cecropia Moth.