Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/07/2021   22:38:15   (   0.05,-137.22) (   0.43,-135.53)  191.76                80
 03/09/2021   10:59:42   (  -0.04,-137.20) (   0.77,-140.70)  400.20                80
 03/10/2021   10:38:06   (  -0.04,-137.19) (  -0.30,-136.13)  121.99                80
 03/11/2021   22:59:42   (   0.03,-137.19) (  -0.92,-141.33)  472.58                80
 03/12/2021   22:43:25   (   0.03,-137.18) (   0.10,-136.74)   49.66                80
 03/15/2021   10:45:56   (  -0.03,-137.16) (   0.03,-137.34)   20.98                80
 03/17/2021   22:45:55   (   0.03,-137.14) (  -0.16,-137.97)   94.94                80
 03/18/2021   22:29:38   (   0.03,-137.12) (   0.86,-133.38)  426.35                80
 03/20/2021   10:51:06   (  -0.02,-137.09) (   0.29,-138.56)  167.45                80