Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2019   10:21:23   (   0.00,-137.22) (  -0.81,-133.55)  418.20                80
 12/14/2019   22:45:43   (  -0.00,-137.21) (  -0.35,-138.78)  178.74                80
 12/15/2019   22:24:07   (   0.00,-137.21) (   0.67,-134.21)  342.50                80
 12/17/2019   10:48:19   (  -0.00,-137.22) (   0.52,-139.41)  250.08                80
 12/18/2019   10:26:44   (  -0.01,-137.21) (  -0.57,-134.84)  270.82                80
 12/19/2019   22:51:02   (   0.00,-137.20) (  -0.65,-140.07)  327.12                80
 12/20/2019   22:29:27   (   0.01,-137.19) (   0.37,-135.49)  193.67                80
 12/22/2019   10:53:38   (   0.00,-137.19) (   0.81,-140.69)  399.43                80
 12/23/2019   10:32:03   (  -0.00,-137.18) (  -0.21,-136.11)  120.96                80
 12/24/2019   22:56:22   (  -0.01,-137.16) (  -0.95,-141.35)  478.13                80
 12/25/2019   22:34:47   (  -0.01,-137.14) (   0.07,-136.77)   41.85                80