Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/08/2021   23:02:17   (   0.01,-137.20) (  -0.85,-140.94)  426.76                80
 05/09/2021   22:40:39   (   0.02,-137.20) (   0.18,-136.35)   96.25                80
 05/11/2021   11:04:48   (  -0.01,-137.20) (   0.97,-141.53)  494.30                80
 05/12/2021   10:43:10   (  -0.02,-137.19) (  -0.07,-136.94)   28.12                80
 05/14/2021   22:45:49   (   0.01,-137.17) (  -0.05,-137.57)   44.72                80
 05/15/2021   22:29:32   (   0.01,-137.16) (   0.98,-132.98)  477.22                80
 05/17/2021   10:50:59   (  -0.01,-137.14) (   0.22,-138.15)  115.02                80
 05/18/2021   10:29:21   (  -0.01,-137.13) (  -0.82,-133.57)  406.40                80
 05/19/2021   22:50:57   (   0.01,-137.10) (  -0.40,-138.77)  190.04                80
 05/20/2021   22:34:39   (   0.01,-137.09) (   0.64,-134.18)  331.20                80