Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/03/2021   22:51:22   (  -0.03,-137.24) (  -0.16,-137.87)   71.25                80
 10/04/2021   22:35:04   (  -0.03,-137.25) (   0.85,-133.27)  453.39                80
 10/06/2021   10:53:50   (   0.03,-137.27) (   0.32,-138.44)  134.35                80
 10/07/2021   10:37:33   (   0.03,-137.28) (  -0.75,-133.86)  389.98                80
 10/08/2021   22:56:28   (  -0.03,-137.28) (  -0.44,-139.06)  202.89                80
 10/09/2021   22:40:09   (  -0.03,-137.29) (   0.58,-134.47)  320.78                80
 10/11/2021   10:58:57   (   0.03,-137.29) (   0.53,-139.65)  268.70                80
 10/12/2021   10:42:38   (   0.03,-137.28) (  -0.49,-135.05)  254.36                80
 10/13/2021   23:01:34   (  -0.02,-137.27) (  -0.70,-140.26)  340.24                80
 10/14/2021   22:45:15   (  -0.02,-137.27) (   0.32,-135.66)  182.60                80