Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2020   10:31:21   (   0.05,-137.19) (  -0.39,-135.33)  212.46                80
 09/13/2020   22:53:00   (  -0.04,-137.19) (  -0.77,-140.56)  383.15                80
 09/14/2020   22:36:43   (  -0.04,-137.19) (   0.25,-135.98)  138.74                80
 09/16/2020   10:55:32   (   0.03,-137.19) (   0.94,-141.16)  453.70                80
 09/17/2020   10:39:16   (   0.03,-137.18) (  -0.09,-136.58)   67.98                80
 09/19/2020   22:39:18   (  -0.03,-137.17) (  -0.06,-137.23)    7.34                80
 09/22/2020   10:41:51   (   0.03,-137.14) (   0.21,-137.83)   79.69                80
 09/23/2020   10:25:34   (   0.03,-137.13) (  -0.81,-133.25)  440.97                80
 09/24/2020   22:44:32   (  -0.02,-137.10) (  -0.35,-138.48)  157.39                80
 09/25/2020   22:28:16   (  -0.02,-137.09) (   0.67,-133.90)  362.91                80