Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/15/2021   10:45:56   (  -0.04,-137.20) (   0.01,-137.34)   16.42                80
 03/17/2021   22:45:56   (   0.04,-137.19) (  -0.14,-137.97)   89.18                80
 03/18/2021   22:29:38   (   0.04,-137.18) (   0.88,-133.38)  432.62                80
 03/20/2021   10:51:07   (  -0.04,-137.16) (   0.27,-138.56)  160.16                80
 03/21/2021   10:29:29   (  -0.04,-137.14) (  -0.75,-133.98)  361.07                80
 03/22/2021   22:51:05   (   0.03,-137.12) (  -0.45,-139.18)  235.40                80
 03/23/2021   22:34:48   (   0.02,-137.10) (   0.58,-134.60)  285.55                80
 03/25/2021   10:56:16   (  -0.01,-137.07) (   0.58,-139.78)  308.43                80
 03/26/2021   10:34:39   (  -0.01,-137.05) (  -0.44,-135.19)  212.04                80