Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/22/2021   10:56:08   (  -0.00,-137.20) (   0.49,-139.36)  246.37                80
 05/23/2021   10:34:30   (  -0.01,-137.19) (  -0.55,-134.77)  276.05                80
 05/24/2021   22:58:46   (   0.00,-137.18) (  -0.61,-139.98)  319.49                80
 05/25/2021   22:37:09   (   0.01,-137.17) (   0.43,-135.40)  202.44                80
 05/27/2021   11:01:16   (  -0.01,-137.15) (   0.75,-140.57)  389.05                80
 05/28/2021   10:39:39   (  -0.01,-137.14) (  -0.30,-135.98)  132.36                80
 05/29/2021   23:01:14   (   0.01,-137.11) (  -0.93,-141.18)  464.81                80
 05/30/2021   22:44:57   (   0.01,-137.09) (   0.11,-136.60)   56.46                80
 06/02/2021   10:47:26   (  -0.00,-137.05) (   0.01,-137.18)   14.52                80