Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 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)
 01/08/2021   22:38:02   (   0.02,-137.23) (   0.35,-135.80)  162.89                80
 01/10/2021   10:56:50   (  -0.01,-137.22) (   0.85,-140.97)  428.19                80
 01/11/2021   10:37:52   (   0.01,-137.22) (  -0.15,-136.38)   94.34                80
 01/13/2021   22:43:12   (  -0.02,-137.20) (  -0.00,-137.01)   21.02                80
 01/16/2021   10:45:44   (   0.01,-137.18) (   0.13,-137.61)   49.65                80
 01/17/2021   10:24:08   (   0.01,-137.17) (  -0.93,-133.03)  472.03                80
 01/18/2021   22:45:45   (  -0.01,-137.16) (  -0.23,-138.25)  124.14                80
 01/19/2021   22:29:27   (  -0.01,-137.15) (   0.77,-133.66)  397.37                80
 01/21/2021   10:50:56   (   0.01,-137.13) (   0.42,-138.84)  195.26                80