Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2020   10:54:59   (  -0.02,-137.23) (   0.75,-140.64)  388.83                80
 12/21/2020   10:38:42   (  -0.01,-137.22) (  -0.30,-136.06)  133.40                80
 12/22/2020   22:57:38   (   0.02,-137.21) (  -0.91,-141.27)  462.63                80
 12/23/2020   22:41:22   (   0.01,-137.21) (   0.15,-136.69)   59.41                80
 12/26/2020   10:41:14   (  -0.00,-137.19) (   0.03,-137.28)   10.69                80
 12/28/2020   22:43:54   (  -0.01,-137.15) (  -0.17,-137.91)   86.80                80
 12/29/2020   22:27:36   (  -0.01,-137.14) (   0.82,-133.32)  433.96                80
 12/31/2020   10:46:25   (   0.01,-137.11) (   0.34,-138.51)  159.73                80
 01/01/2021   10:30:09   (   0.00,-137.09) (  -0.71,-133.93)  360.54                80