What is ironic, as you mention this at start of Dec 2020 is, that thet Bing Photo shadow was probably generated about early Dec,20??, as that date provided the right length shadow in that same direction.
I Active-Paused near the Monument, and altered time & month, to make the MSFS shadow match the Bing one.
Interesting! Did you arrive at a particular date that the Bing photo may have been created? Would be interesting if we could (somehow) obtain the actual aerial photo date and compare it to see how accurate MSFS shadows are!