Thread by @CSBiggers

@planetlabs has a series of great collects of China's Jiuquan Satellite Launch Center. Interestingly, the rotating service structure on pad 921 underwent modification in June likely to accommodate a larger payload fairing on the LM-2F rocket for the 4 September launch.

Here's a quick look at the service structure before modification.

Here's a nice off nadir shot during modification in June with a section of the structure removed.

And after modification...

The day of the launch with the LM-2F on the pad.

Lastly, a hazy shot later in the day prior to launch with the swing arms open.