Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/01/2021   10:48:44   (   0.03,-137.18) (   0.06,-137.25)    7.98                80
 10/03/2021   22:51:22   (  -0.02,-137.16) (  -0.18,-137.87)   80.51                80
 10/04/2021   22:35:04   (  -0.02,-137.15) (   0.84,-133.27)  441.56                80
 10/06/2021   10:53:50   (   0.01,-137.13) (   0.34,-138.44)  150.45                80
 10/07/2021   10:37:32   (   0.02,-137.11) (  -0.73,-133.86)  371.28                80
 10/08/2021   22:56:28   (  -0.02,-137.08) (  -0.45,-139.06)  225.19                80
 10/09/2021   22:40:09   (  -0.02,-137.06) (   0.57,-134.47)  295.93                80
 10/11/2021   10:58:55   (   0.02,-137.02) (   0.61,-139.63)  297.71                80
 10/12/2021   10:42:37   (   0.01,-137.00) (  -0.41,-135.04)  222.74                80