Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 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)
 10/01/2021   10:51:25   (   0.04,-137.19) (   0.02,-137.25)    7.67                80
 10/03/2021   22:51:22   (  -0.03,-137.17) (  -0.19,-137.86)   79.48                80
 10/04/2021   22:35:03   (  -0.03,-137.16) (   0.82,-133.27)  442.73                80
 10/06/2021   10:53:51   (   0.02,-137.13) (   0.29,-138.45)  149.28                80
 10/07/2021   10:37:32   (   0.03,-137.12) (  -0.72,-133.85)  372.55                80
 10/08/2021   22:56:27   (  -0.03,-137.09) (  -0.46,-139.06)  223.57                80
 10/09/2021   22:40:09   (  -0.03,-137.07) (   0.55,-134.46)  297.66                80
 10/11/2021   10:58:55   (   0.02,-137.04) (   0.62,-139.63)  295.97                80
 10/12/2021   10:42:37   (   0.02,-137.01) (  -0.40,-135.03)  224.61                80
 10/13/2021   23:01:33   (  -0.01,-136.97) (  -0.72,-140.25)  373.35                80