Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/04/2019   22:32:23   (   0.00,-137.20) (   0.22,-136.21)  112.61                80
 12/06/2019   10:56:34   (   0.00,-137.20) (   0.97,-141.41)  479.87                80
 12/07/2019   10:34:59   (   0.00,-137.20) (  -0.05,-136.83)   41.25                80
 12/09/2019   22:40:22   (  -0.01,-137.18) (  -0.09,-137.49)   36.20                80
 12/10/2019   22:18:47   (  -0.01,-137.17) (   0.94,-132.92)  484.16                80
 12/12/2019   10:42:58   (   0.01,-137.16) (   0.25,-138.12)  110.06                80
 12/13/2019   10:21:23   (   0.01,-137.14) (  -0.77,-133.54)  409.65                80
 12/14/2019   22:45:42   (  -0.02,-137.11) (  -0.39,-138.78)  190.44                80
 12/15/2019   22:24:07   (  -0.01,-137.09) (   0.64,-134.20)  328.73                80
 12/17/2019   10:48:18   (   0.01,-137.06) (   0.55,-139.40)  266.92                80
 12/18/2019   10:26:42   (   0.01,-137.04) (  -0.47,-134.83)  251.96                80