Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/18/2020   22:36:09   (   0.01,-137.23) (   0.41,-135.45)  202.31                80
 12/20/2020   10:54:59   (  -0.01,-137.23) (   0.76,-140.64)  388.71                80
 12/21/2020   10:38:42   (  -0.01,-137.23) (  -0.29,-136.06)  133.57                80
 12/22/2020   22:57:38   (   0.01,-137.21) (  -0.91,-141.27)  462.30                80
 12/23/2020   22:41:22   (   0.01,-137.21) (   0.14,-136.69)   59.78                80
 12/26/2020   10:41:14   (  -0.00,-137.20) (   0.03,-137.28)   10.36                80
 12/28/2020   22:43:54   (  -0.01,-137.16) (  -0.18,-137.91)   86.17                80
 12/29/2020   22:27:37   (  -0.01,-137.14) (   0.87,-133.33)  434.64                80
 12/31/2020   10:46:26   (   0.01,-137.12) (   0.29,-138.52)  159.07                80