Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2019   22:18:47   (  -0.01,-137.20) (   0.92,-132.91)  487.54                80
 12/12/2019   10:42:59   (   0.01,-137.21) (   0.21,-138.12)  103.88                80
 12/13/2019   10:21:23   (   0.01,-137.21) (  -0.81,-133.55)  417.49                80
 12/14/2019   22:45:43   (  -0.01,-137.20) (  -0.34,-138.78)  180.24                80
 12/15/2019   22:24:07   (  -0.01,-137.19) (   0.68,-134.21)  340.70                80
 12/17/2019   10:48:19   (   0.01,-137.20) (   0.50,-139.41)  252.08                80
 12/18/2019   10:26:43   (   0.00,-137.19) (  -0.52,-134.83)  268.51                80
 12/19/2019   22:51:02   (  -0.01,-137.17) (  -0.64,-140.07)  330.12                80
 12/20/2019   22:29:27   (  -0.00,-137.16) (   0.39,-135.50)  190.35                80
 12/22/2019   10:53:38   (   0.01,-137.16) (   0.79,-140.69)  403.00                80
 12/23/2019   10:32:03   (   0.01,-137.14) (  -0.24,-136.12)  117.06                80