Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/06/2021   10:53:50   (   0.03,-137.22) (   0.31,-138.44)  139.81                80
 10/07/2021   10:37:32   (   0.03,-137.21) (  -0.71,-133.85)  383.39                80
 10/08/2021   22:56:27   (  -0.03,-137.20) (  -0.47,-139.05)  211.15                80
 10/09/2021   22:40:10   (  -0.03,-137.20) (   0.60,-134.47)  311.46                80
 10/11/2021   10:58:56   (   0.03,-137.18) (   0.56,-139.64)  279.66                80
 10/12/2021   10:42:37   (   0.03,-137.17) (  -0.46,-135.04)  242.30                80
 10/13/2021   23:01:33   (  -0.02,-137.14) (  -0.73,-140.25)  353.97                80
 10/14/2021   22:45:14   (  -0.02,-137.13) (   0.29,-135.65)  167.80                80
 10/16/2021   11:04:01   (   0.01,-137.11) (   0.87,-140.82)  423.98                80
 10/17/2021   10:47:42   (   0.01,-137.09) (  -0.15,-136.23)   97.81                80
 10/18/2021   23:06:38   (  -0.01,-137.06) (  -0.97,-141.44)  498.65                80