Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2019   22:52:08   (   0.02,-137.21) (  -0.81,-140.99)  430.68                80
 09/21/2019   22:35:53   (   0.02,-137.21) (   0.19,-136.41)   90.17                80
 09/24/2019   10:35:49   (  -0.03,-137.19) (  -0.09,-137.05)   16.89                80
 09/26/2019   22:38:34   (   0.03,-137.17) (  -0.11,-137.71)   62.52                80
 09/27/2019   22:22:20   (   0.03,-137.16) (   0.95,-133.15)  457.47                80
 09/29/2019   10:43:50   (  -0.03,-137.14) (   0.27,-138.34)  137.46                80
 09/30/2019   10:22:16   (  -0.03,-137.13) (  -0.79,-133.78)  382.24                80
 10/01/2019   22:43:56   (   0.02,-137.10) (  -0.40,-139.01)  217.79                80
 10/02/2019   22:27:40   (   0.02,-137.09) (   0.60,-134.44)  301.67                80