Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/14/2020   22:36:43   (  -0.04,-137.20) (   0.26,-135.98)  139.22                80
 09/16/2020   10:55:33   (   0.03,-137.19) (   0.92,-141.17)  453.09                80
 09/17/2020   10:39:16   (   0.03,-137.19) (  -0.10,-136.59)   68.68                80
 09/19/2020   22:39:18   (  -0.03,-137.18) (  -0.04,-137.23)    6.07                80
 09/22/2020   10:41:51   (   0.03,-137.15) (   0.20,-137.84)   78.30                80
 09/23/2020   10:25:34   (   0.03,-137.14) (  -0.83,-133.25)  442.44                80
 09/24/2020   22:44:33   (  -0.02,-137.12) (  -0.34,-138.48)  155.64                80
 09/25/2020   22:28:16   (  -0.02,-137.10) (   0.69,-133.90)  364.75                80
 09/27/2020   10:47:05   (   0.01,-137.08) (   0.49,-139.09)  229.80                80