Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/01/2021   10:51:25   (   0.04,-137.22) (   0.03,-137.25)    4.05                80
 10/03/2021   22:51:22   (  -0.03,-137.24) (  -0.15,-137.87)   71.68                80
 10/04/2021   22:35:04   (  -0.03,-137.25) (   0.87,-133.28)  452.44                80
 10/06/2021   10:53:50   (   0.02,-137.25) (   0.31,-138.44)  136.58                80
 10/07/2021   10:37:33   (   0.03,-137.25) (  -0.77,-133.86)  387.16                80
 10/08/2021   22:56:28   (  -0.03,-137.25) (  -0.42,-139.07)  206.13                80
 10/09/2021   22:40:10   (  -0.03,-137.25) (   0.59,-134.47)  316.99                80
 10/11/2021   10:58:56   (   0.02,-137.24) (   0.57,-139.64)  273.72                80
 10/12/2021   10:42:38   (   0.02,-137.23) (  -0.44,-135.04)  248.76                80
 10/13/2021   23:01:34   (  -0.01,-137.22) (  -0.68,-140.26)  346.30                80
 10/14/2021   22:45:15   (  -0.01,-137.21) (   0.33,-135.67)  175.97                80