Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2019   10:42:59   (   0.02,-137.22) (   0.23,-138.12)  103.18                80
 12/13/2019   10:21:23   (   0.01,-137.22) (  -0.79,-133.54)  418.46                80
 12/14/2019   22:45:42   (  -0.01,-137.21) (  -0.37,-138.78)  178.81                80
 12/15/2019   22:24:07   (  -0.01,-137.21) (   0.66,-134.20)  342.39                80
 12/17/2019   10:48:18   (   0.01,-137.22) (   0.52,-139.40)  250.00                80
 12/18/2019   10:26:43   (   0.00,-137.21) (  -0.50,-134.83)  270.88                80
 12/19/2019   22:51:02   (  -0.01,-137.19) (  -0.65,-140.06)  327.33                80
 12/20/2019   22:29:27   (  -0.00,-137.19) (   0.37,-135.49)  193.39                80
 12/22/2019   10:53:38   (   0.02,-137.19) (   0.81,-140.69)  399.52                80
 12/23/2019   10:32:02   (   0.01,-137.18) (  -0.22,-136.12)  120.78                80
 12/24/2019   22:56:21   (  -0.02,-137.15) (  -0.99,-141.34)  478.52                80