Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2020   10:49:46   (  -0.01,-137.23) (   0.45,-139.41)  247.40                80
 12/16/2020   10:33:29   (  -0.00,-137.23) (  -0.54,-134.82)  275.32                80
 12/17/2020   22:52:26   (   0.00,-137.23) (  -0.60,-140.04)  319.93                80
 12/18/2020   22:36:09   (   0.00,-137.23) (   0.39,-135.45)  202.59                80
 12/20/2020   10:54:58   (  -0.01,-137.23) (   0.77,-140.63)  388.32                80
 12/21/2020   10:38:42   (  -0.00,-137.23) (  -0.28,-136.06)  134.06                80
 12/22/2020   22:57:38   (   0.01,-137.22) (  -0.92,-141.27)  461.58                80
 12/23/2020   22:41:22   (   0.00,-137.22) (   0.14,-136.69)   60.60                80
 12/26/2020   10:41:13   (   0.00,-137.20) (   0.03,-137.28)    9.28                80
 12/28/2020   22:43:53   (  -0.01,-137.17) (  -0.16,-137.92)   84.97                80