Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/04/2021   22:35:03   (  -0.03,-137.22) (   0.83,-133.27)  449.52                80
 10/06/2021   10:53:51   (   0.03,-137.21) (   0.29,-138.45)  140.10                80
 10/07/2021   10:37:32   (   0.03,-137.21) (  -0.73,-133.85)  383.05                80
 10/08/2021   22:56:27   (  -0.03,-137.20) (  -0.46,-139.06)  211.45                80
 10/09/2021   22:40:09   (  -0.03,-137.19) (   0.56,-134.46)  311.09                80
 10/11/2021   10:58:55   (   0.03,-137.18) (   0.60,-139.63)  280.22                80
 10/12/2021   10:42:38   (   0.03,-137.16) (  -0.47,-135.05)  241.70                80
 10/13/2021   23:01:33   (  -0.02,-137.14) (  -0.71,-140.25)  354.58                80
 10/14/2021   22:45:15   (  -0.02,-137.12) (   0.31,-135.66)  167.11                80
 10/16/2021   11:04:01   (   0.01,-137.10) (   0.85,-140.83)  424.83                80
 10/17/2021   10:47:42   (   0.01,-137.08) (  -0.17,-136.23)   96.85                80