Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 5 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/30/2021   22:42:17   (   0.00,-137.19) (   0.15,-136.60)   67.16                80
 06/02/2021   10:47:26   (   0.00,-137.18) (   0.03,-137.18)    3.24                80
 06/04/2021   22:50:05   (  -0.00,-137.16) (  -0.17,-137.80)   73.42                80
 06/05/2021   22:31:08   (   0.00,-137.16) (   0.87,-133.21)  448.87                80
 06/07/2021   10:52:35   (   0.00,-137.14) (   0.29,-138.39)  142.27                80
 06/08/2021   10:30:58   (  -0.00,-137.13) (  -0.75,-133.80)  379.39                80
 06/09/2021   22:52:34   (   0.00,-137.11) (  -0.43,-139.01)  217.29                80
 06/10/2021   22:36:16   (   0.01,-137.09) (   0.61,-134.43)  304.02                80
 06/12/2021   10:57:44   (  -0.01,-137.07) (   0.54,-139.60)  288.45                80