Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/23/2021   10:30:35   (   0.18,-128.32) (   1.10,-132.36)  460.54                80
 10/24/2021   10:14:16   (   0.20,-128.34) (   0.08,-127.77)   64.89                80
 10/26/2021   22:14:14   (  -0.19,-128.36) (  -0.19,-128.39)    3.32                80
 10/29/2021   10:16:42   (   0.17,-128.40) (   0.31,-128.97)   65.40                80
 10/30/2021   10:00:23   (   0.18,-128.40) (  -0.72,-124.37)  459.25                80
 10/31/2021   22:19:20   (  -0.15,-128.40) (  -0.41,-129.59)  135.09                80
 11/01/2021   22:03:01   (  -0.16,-128.41) (   0.62,-124.99)  389.49                80
 11/03/2021   10:21:48   (   0.13,-128.43) (   0.53,-130.17)  198.17                80
 11/04/2021   10:05:29   (   0.15,-128.43) (  -0.50,-125.57)  325.98                80