I am doing a simple well location map that involves me taking the coordinates from a table (coordinates that are in New York Long Island State Plane 3104), plugging them into Excel and then using the "Find XY" tool on ArcGIS in order to show them visually. The data frame properties have also been set to New York Long Island State Plane. I've downloaded aerial images from a New York State GIS site (https://orthos.dhses.ny.gov/# for those interested). I confirmed both through my boss and Google Earth that according to the coordinates in both decimal degrees and NY Stateplane these images are where my wells are located. However, when I add my aerial images to my map document, the images are shifted in longitude by about 5 miles or so. Latitude wise (Y value) they are correct, but the longitude value (X value) is wrong.
How can I fix this?
I can post pictures and my files as needed.