Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/01/2021   22:58:40   (  -0.05,-137.21) (  -0.65,-139.87)  304.07                80
 09/02/2021   22:42:23   (  -0.05,-137.21) (   0.41,-135.29)  219.16                80
 09/04/2021   11:01:10   (   0.04,-137.20) (   0.77,-140.46)  371.33                80
 09/05/2021   10:44:52   (   0.04,-137.20) (  -0.24,-135.87)  151.52                80
 09/06/2021   23:03:47   (  -0.03,-137.19) (  -0.92,-141.07)  442.74                80
 09/07/2021   22:47:29   (  -0.03,-137.19) (   0.14,-136.49)   79.94                80
 09/10/2021   10:47:18   (   0.03,-137.17) (   0.03,-137.07)   11.28                80
 09/12/2021   22:49:56   (  -0.03,-137.13) (  -0.13,-137.69)   62.95                80
 09/13/2021   22:33:38   (  -0.03,-137.12) (   0.88,-133.09)  458.47                80