Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 10 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/18/2021   10:25:29   (   0.21,-128.23) (   0.87,-131.17)  334.97                80
 10/19/2021   10:09:10   (   0.23,-128.25) (  -0.15,-126.57)  191.39                80
 10/20/2021   22:28:07   (  -0.20,-128.27) (  -0.98,-131.79)  401.11                80
 10/21/2021   22:11:48   (  -0.21,-128.29) (   0.04,-127.19)  125.04                80
 10/23/2021   10:30:35   (   0.18,-128.34) (   1.10,-132.36)  459.52                80
 10/24/2021   10:14:16   (   0.20,-128.35) (   0.08,-127.77)   66.16                80
 10/26/2021   22:15:22   (  -0.18,-128.37) (  -0.18,-128.39)    2.42                12
 10/29/2021   10:16:42   (   0.17,-128.42) (   0.30,-128.97)   63.18                80
 10/30/2021   10:00:23   (   0.18,-128.43) (  -0.72,-124.38)  461.71                80