Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 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)
 05/24/2021   22:58:46   (   0.00,-137.20) (  -0.61,-139.98)  317.30                80
 05/25/2021   22:37:09   (   0.01,-137.20) (   0.42,-135.40)  205.55                80
 05/27/2021   11:01:16   (  -0.00,-137.20) (   0.75,-140.57)  384.51                80
 05/28/2021   10:39:39   (  -0.01,-137.19) (  -0.29,-135.98)  137.77                80
 05/29/2021   23:01:15   (   0.01,-137.17) (  -0.88,-141.19)  457.93                80
 05/30/2021   22:44:58   (   0.01,-137.17) (   0.16,-136.61)   64.31                80
 06/02/2021   10:47:26   (  -0.00,-137.15) (   0.03,-137.18)    5.06                80
 06/04/2021   22:47:25   (   0.00,-137.12) (  -0.16,-137.81)   78.42                80
 06/05/2021   22:31:08   (   0.00,-137.11) (   0.88,-133.22)  443.45                80