Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 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)
 09/16/2020   10:55:32   (   0.03,-137.19) (   0.94,-141.16)  452.84                80
 09/17/2020   10:39:16   (   0.03,-137.19) (  -0.08,-136.58)   69.05                80
 09/19/2020   22:39:18   (  -0.03,-137.18) (  -0.06,-137.23)    5.96                80
 09/22/2020   10:41:50   (   0.03,-137.16) (   0.21,-137.83)   77.65                80
 09/23/2020   10:25:34   (   0.03,-137.14) (  -0.82,-133.25)  443.21                80
 09/24/2020   22:44:32   (  -0.02,-137.12) (  -0.35,-138.48)  154.84                80
 09/25/2020   22:28:16   (  -0.02,-137.11) (   0.68,-133.90)  365.65                80
 09/27/2020   10:47:06   (   0.01,-137.09) (   0.43,-139.10)  228.73                80
 09/28/2020   10:30:50   (   0.01,-137.07) (  -0.59,-134.52)  291.65                80