Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/18/2019   10:52:02   (  -0.02,-137.21) (   0.68,-140.32)  354.44                80
 09/19/2019   10:30:28   (  -0.02,-137.21) (  -0.38,-135.75)  166.91                80
 09/20/2019   22:52:08   (   0.02,-137.20) (  -0.81,-140.99)  431.07                80
 09/21/2019   22:35:52   (   0.02,-137.20) (   0.19,-136.41)   89.72                80
 09/24/2019   10:35:48   (  -0.02,-137.19) (  -0.03,-137.04)   16.62                80
 09/26/2019   22:38:34   (   0.02,-137.16) (  -0.10,-137.71)   63.39                80
 09/27/2019   22:22:19   (   0.02,-137.15) (   0.90,-133.14)  456.52                80
 09/29/2019   10:43:50   (  -0.02,-137.13) (   0.26,-138.34)  138.10                80
 09/30/2019   10:22:15   (  -0.02,-137.12) (  -0.80,-133.78)  381.52                80
 10/01/2019   22:46:35   (   0.01,-137.09) (  -0.44,-139.00)  218.91                80