Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/27/2019   22:22:19   (   0.03,-137.20) (   0.91,-133.13)  462.80                80
 09/29/2019   10:43:50   (  -0.02,-137.20) (   0.25,-138.34)  129.83                80
 09/30/2019   10:22:16   (  -0.03,-137.20) (  -0.82,-133.78)  391.31                80
 10/01/2019   22:46:35   (  -0.02,-137.20) (  -0.43,-139.00)  205.73                80
 10/02/2019   22:25:00   (  -0.01,-137.20) (   0.63,-134.44)  315.04                80
 10/04/2019   10:49:11   (   0.02,-137.19) (   0.58,-139.63)  278.64                80
 10/05/2019   10:27:36   (   0.01,-137.18) (  -0.48,-135.07)  241.67                80
 10/06/2019   22:51:57   (  -0.01,-137.17) (  -0.71,-140.30)  357.42                80
 10/07/2019   22:30:21   (  -0.01,-137.16) (   0.30,-135.73)  162.67                80
 10/09/2019   10:54:32   (   0.02,-137.14) (   0.86,-140.93)  431.71                80
 10/10/2019   10:32:57   (   0.02,-137.13) (  -0.15,-136.36)   88.23                80