Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/09/2021   18:32:18   (   0.01, -75.18) (   0.70, -72.03)  358.77                80
 12/11/2021   06:52:00   (  -0.01, -75.19) (   0.49, -77.43)  255.30                80
 12/12/2021   06:36:17   (  -0.01, -75.20) (  -0.50, -72.98)  252.45                80
 12/13/2021   18:56:08   (   0.01, -75.21) (  -0.70, -78.42)  364.90                80
 12/14/2021   18:40:26   (   0.01, -75.23) (   0.30, -73.97)  143.36                80
 12/16/2021   07:02:47   (  -0.01, -75.24) (   0.90, -79.36)  469.22                80
 12/17/2021   06:44:25   (  -0.00, -75.26) (  -0.10, -74.92)   39.23                80
 12/19/2021   18:45:53   (  -0.01, -75.29) (  -0.15, -75.90)   68.86                80
 12/20/2021   18:30:10   (  -0.01, -75.31) (   0.85, -71.45)  439.86                80
 12/22/2021   06:52:31   (   0.01, -75.34) (   0.35, -76.84)  171.90                80