Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2021   23:00:08   (  -0.03,-137.20) (  -0.71,-140.06)  327.02                80
 09/23/2021   22:43:50   (  -0.04,-137.20) (   0.36,-135.48)  196.13                80
 09/25/2021   11:02:36   (   0.03,-137.20) (   0.84,-140.64)  393.80                80
 09/26/2021   10:46:19   (   0.04,-137.19) (  -0.23,-136.06)  128.80                80
 09/27/2021   23:05:14   (  -0.03,-137.17) (  -0.94,-141.27)  466.87                80
 09/28/2021   22:48:56   (  -0.03,-137.16) (   0.06,-136.67)   55.22                80
 10/01/2021   10:48:45   (   0.02,-137.13) (   0.06,-137.25)   14.64                80
 10/03/2021   22:51:22   (  -0.01,-137.08) (  -0.17,-137.88)   90.28                80
 10/04/2021   22:35:04   (  -0.01,-137.06) (   0.84,-133.28)  431.07                80