Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2020   22:57:19   (   0.00,-137.23) (   0.00,-141.10)  430.33                 0
 12/02/2020   22:39:28   (  -0.00,-137.22) (   0.22,-136.33)  102.02                80
 12/04/2020   10:58:18   (   0.00,-137.21) (   0.94,-141.52)  490.37                80
 12/05/2020   10:42:00   (   0.00,-137.20) (  -0.04,-136.93)   30.93                80
 12/07/2020   22:42:01   (  -0.00,-137.16) (  -0.07,-137.57)   45.60                80
 12/08/2020   22:25:44   (  -0.00,-137.15) (   0.92,-132.98)  475.39                80
 12/10/2020   10:44:33   (   0.00,-137.13) (   0.25,-138.16)  118.17                80
 12/11/2020   10:28:16   (   0.00,-137.11) (  -0.80,-133.58)  402.29                80
 12/12/2020   22:47:13   (  -0.00,-137.07) (  -0.41,-138.79)  196.52                80
 12/13/2020   22:30:56   (  -0.01,-137.05) (   0.64,-134.21)  323.47                80
 12/15/2020   10:52:26   (   0.00,-137.02) (   0.54,-139.40)  271.50                80