Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 8 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/20/2021   10:45:50   (   0.05,-137.17) (  -0.04,-136.87)   35.27                80
 08/22/2021   22:48:27   (  -0.04,-137.14) (  -0.12,-137.48)   38.43                80
 08/23/2021   22:32:09   (  -0.04,-137.13) (   0.94,-132.89)  483.73                80
 08/25/2021   10:53:36   (   0.03,-137.12) (   0.24,-138.06)  107.43                80
 08/26/2021   10:31:58   (   0.03,-137.11) (  -0.76,-133.47)  414.51                80
 08/27/2021   22:53:33   (  -0.03,-137.08) (  -0.40,-138.68)  181.92                80
 08/28/2021   22:37:16   (  -0.03,-137.07) (   0.66,-134.09)  339.67                80
 08/30/2021   10:56:03   (   0.03,-137.05) (   0.52,-139.26)  252.64                80
 08/31/2021   10:39:45   (   0.02,-137.03) (  -0.48,-134.67)  268.31                80
 09/01/2021   22:58:40   (  -0.01,-136.98) (  -0.67,-139.88)  329.96                80
 09/02/2021   22:42:22   (  -0.00,-136.96) (   0.40,-135.29)  190.48                80