Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2019   22:46:46   (   0.02,-137.19) (  -0.51,-139.69)  284.96                80
 09/16/2019   22:30:31   (   0.02,-137.19) (   0.49,-135.11)  236.79                80
 09/18/2019   10:52:02   (  -0.02,-137.21) (   0.69,-140.32)  354.82                80
 09/19/2019   10:30:28   (  -0.02,-137.21) (  -0.37,-135.75)  166.36                80
 09/20/2019   22:54:48   (   0.02,-137.19) (  -0.82,-140.99)  432.48                80
 09/21/2019   22:33:22   (   0.02,-137.19) (   0.18,-136.41)   88.14                70
 09/24/2019   10:35:49   (  -0.02,-137.18) (  -0.07,-137.05)   15.10                80
 09/26/2019   22:38:34   (   0.02,-137.14) (  -0.12,-137.71)   65.98                80
 09/27/2019   22:22:20   (   0.02,-137.13) (   0.94,-133.15)  453.81                80