Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2020   22:25:44   (   0.01,-137.22) (   0.94,-132.98)  483.54                80
 12/10/2020   10:44:33   (  -0.01,-137.23) (   0.23,-138.16)  107.44                80
 12/11/2020   10:28:17   (  -0.01,-137.22) (  -0.82,-133.58)  415.00                80
 12/12/2020   22:47:14   (   0.00,-137.22) (  -0.33,-138.81)  180.66                80
 12/13/2020   22:30:56   (  -0.00,-137.21) (   0.66,-134.21)  341.31                80
 12/15/2020   10:49:46   (   0.00,-137.20) (   0.50,-139.40)  250.93                80
 12/16/2020   10:33:29   (   0.01,-137.19) (  -0.55,-134.82)  270.54                80
 12/17/2020   22:52:26   (  -0.01,-137.17) (  -0.65,-140.03)  326.33                80
 12/18/2020   22:36:09   (  -0.01,-137.16) (   0.40,-135.45)  195.02                80
 12/20/2020   10:57:38   (   0.01,-137.14) (   0.77,-140.64)  397.79                80
 12/21/2020   10:36:01   (   0.01,-137.13) (  -0.23,-136.05)  123.37                80