Simultaneous Nadir Overpasses (SNOs) between GOES-16 and FY3D
TLE Epoch: 2021 4 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)
 04/09/2021   18:46:05   (   0.03, -75.20) (  -0.53, -77.80)  296.60                80
 04/10/2021   18:29:48   (   0.03, -75.20) (   0.50, -73.22)  226.84                80
 04/12/2021   06:51:16   (  -0.03, -75.21) (   0.67, -78.39)  362.48                80
 04/13/2021   06:29:39   (  -0.03, -75.22) (  -0.36, -73.81)  160.97                80
 04/14/2021   18:51:15   (   0.03, -75.23) (  -0.80, -79.02)  431.88                80
 04/15/2021   18:34:58   (   0.03, -75.24) (   0.23, -74.43)   92.08                80
 04/17/2021   06:56:26   (  -0.02, -75.25) (   0.94, -79.61)  496.30                80
 04/18/2021   06:34:48   (  -0.03, -75.26) (  -0.09, -75.02)   27.58                80
 04/20/2021   18:37:26   (   0.02, -75.29) (  -0.08, -75.64)   40.62                80
 04/21/2021   18:21:09   (   0.02, -75.30) (   0.95, -71.05)  483.94                80