Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-16)   GOES-16 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2021   18:48:01   (   0.00, -75.18) (  -0.27, -76.49)  148.39                80
 12/09/2021   18:32:19   (   0.00, -75.18) (   0.72, -72.04)  358.97                80
 12/11/2021   06:52:00   (  -0.01, -75.19) (   0.47, -77.43)  254.86                80
 12/12/2021   06:36:18   (  -0.01, -75.20) (  -0.52, -72.99)  253.04                80
 12/13/2021   18:56:08   (   0.01, -75.22) (  -0.74, -78.41)  364.13                80
 12/14/2021   18:40:25   (   0.00, -75.23) (   0.26, -73.96)  144.29                80
 12/16/2021   07:02:47   (  -0.00, -75.25) (   0.94, -79.36)  468.10                80
 12/17/2021   06:41:44   (   0.00, -75.27) (  -0.06, -74.91)   40.45                80
 12/19/2021   18:45:53   (  -0.01, -75.31) (  -0.14, -75.90)   67.36                80
 12/20/2021   18:30:11   (  -0.01, -75.33) (   0.86, -71.45)  441.42                80