Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2021   11:02:37   (   0.04,-137.22) (   0.80,-140.65)  391.35                80
 09/26/2021   10:46:18   (   0.04,-137.22) (  -0.21,-136.06)  132.05                80
 09/27/2021   23:05:14   (  -0.03,-137.21) (  -0.96,-141.26)  462.23                80
 09/28/2021   22:48:56   (  -0.03,-137.21) (   0.11,-136.68)   60.67                80
 10/01/2021   10:51:25   (   0.02,-137.19) (   0.01,-137.26)    7.67                80
 10/03/2021   22:51:22   (  -0.01,-137.16) (  -0.18,-137.87)   80.70                80
 10/04/2021   22:35:03   (  -0.01,-137.15) (   0.84,-133.28)  441.44                80
 10/06/2021   10:53:51   (   0.01,-137.14) (   0.28,-138.46)  149.82                80
 10/07/2021   10:37:32   (   0.01,-137.12) (  -0.73,-133.86)  371.96                80