Photo date: February 27, 2017. Photographer: Mark Mahin.
The first photo below shows a mysterious blue orb I photographed last night in front of a window at Grand Central Terminal in New York. The two lower photos show two other orbs I photographed at the same position (or a very similar position) on February 21, 2017, as reported here. Note that in all three cases the orb is just a little to the right of the top of the arch.