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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2020   22:52:27   (   0.01,-137.23) (  -0.59,-140.04)  320.26                80
 12/18/2020   22:36:09   (   0.01,-137.22) (   0.40,-135.45)  202.11                80
 12/20/2020   10:54:58   (  -0.01,-137.23) (   0.77,-140.63)  388.96                80
 12/21/2020   10:38:42   (  -0.01,-137.22) (  -0.28,-136.06)  133.26                80
 12/22/2020   22:57:38   (   0.01,-137.21) (  -0.92,-141.26)  462.72                80
 12/23/2020   22:41:22   (   0.01,-137.21) (   0.13,-136.69)   59.30                80
 12/26/2020   10:41:14   (  -0.00,-137.19) (   0.05,-137.28)   11.21                80
 12/28/2020   22:43:53   (  -0.01,-137.15) (  -0.19,-137.91)   86.96                80
 12/29/2020   22:27:37   (  -0.01,-137.14) (   0.86,-133.33)  433.80                80