Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 10 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/08/2020   10:41:18   (   0.04,-137.20) (  -0.01,-137.00)   23.08                80
 10/10/2020   22:41:20   (  -0.03,-137.19) (  -0.15,-137.64)   52.43                80
 10/11/2020   22:25:04   (  -0.03,-137.18) (   0.88,-133.06)  468.73                80
 10/13/2020   10:43:53   (   0.02,-137.16) (   0.26,-138.25)  124.57                80
 10/14/2020   10:27:37   (   0.02,-137.15) (  -0.77,-133.67)  396.28                80
 10/15/2020   22:46:35   (  -0.02,-137.13) (  -0.41,-138.90)  201.71                80
 10/16/2020   22:30:18   (  -0.02,-137.11) (   0.62,-134.31)  318.93                80
 10/18/2020   10:49:07   (   0.02,-137.08) (   0.59,-139.49)  275.26                80
 10/19/2020   10:32:50   (   0.02,-137.06) (  -0.44,-134.91)  244.81                80
 10/20/2020   22:51:49   (  -0.02,-137.03) (  -0.73,-140.14)  354.70                80
 10/21/2020   22:35:32   (  -0.02,-137.00) (   0.30,-135.56)  164.93                80