Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 10 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/01/2019   22:43:56   (   0.02,-137.20) (  -0.39,-139.01)  206.59                80
 10/02/2019   22:25:00   (  -0.01,-137.19) (   0.61,-134.43)  314.77                80
 10/04/2019   10:49:11   (   0.01,-137.19) (   0.54,-139.64)  278.46                80
 10/05/2019   10:27:36   (   0.01,-137.18) (  -0.46,-135.06)  241.82                80
 10/06/2019   22:51:56   (  -0.01,-137.16) (  -0.74,-140.30)  357.77                80
 10/07/2019   22:30:22   (  -0.00,-137.15) (   0.33,-135.73)  162.28                80
 10/09/2019   10:54:33   (   0.00,-137.14) (   0.83,-140.94)  431.80                80
 10/10/2019   10:32:58   (   0.00,-137.13) (  -0.17,-136.36)   88.08                80
 10/12/2019   22:38:23   (  -0.03,-137.09) (  -0.01,-137.02)    8.06                80