Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2020   10:52:57   (   0.05,-137.19) (   0.68,-139.91)  309.89                80
 09/12/2020   10:31:21   (   0.05,-137.19) (  -0.35,-135.32)  212.35                80
 09/13/2020   22:52:59   (  -0.04,-137.19) (  -0.81,-140.55)  383.39                80
 09/14/2020   22:36:43   (  -0.03,-137.19) (   0.27,-135.98)  138.49                80
 09/16/2020   10:55:33   (   0.03,-137.19) (   0.92,-141.17)  453.97                80
 09/17/2020   10:39:16   (   0.03,-137.18) (  -0.10,-136.59)   67.63                80
 09/19/2020   22:39:18   (  -0.03,-137.16) (  -0.04,-137.23)    7.66                80
 09/22/2020   10:41:51   (   0.03,-137.14) (   0.19,-137.84)   80.15                80
 09/23/2020   10:25:34   (   0.03,-137.12) (  -0.83,-133.26)  440.41                80
 09/24/2020   22:44:33   (  -0.02,-137.10) (  -0.33,-138.48)  158.04                80