Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2019   10:48:18   (   0.01,-137.22) (   0.52,-139.40)  249.22                80
 12/18/2019   10:26:43   (   0.00,-137.22) (  -0.51,-134.83)  271.88                80
 12/19/2019   22:51:02   (  -0.01,-137.21) (  -0.65,-140.06)  325.34                80
 12/20/2019   22:29:27   (  -0.00,-137.21) (   0.37,-135.49)  195.64                80
 12/22/2019   10:53:38   (   0.01,-137.20) (   0.81,-140.69)  397.61                80
 12/23/2019   10:32:03   (   0.01,-137.19) (  -0.22,-136.11)  122.92                80
 12/24/2019   22:56:22   (  -0.02,-137.17) (  -0.95,-141.35)  475.45                80
 12/25/2019   22:34:46   (  -0.02,-137.16) (   0.08,-136.77)   44.74                80
 12/28/2019   10:40:02   (   0.02,-137.14) (   0.07,-137.40)   29.74                80
 12/29/2019   10:18:27   (   0.01,-137.12) (  -0.96,-132.82)  489.95                80