Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2019 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2019   10:34:59   (   0.00,-137.20) (  -0.10,-136.84)   41.53                80
 12/09/2019   22:40:22   (  -0.01,-137.18) (  -0.10,-137.49)   35.69                80
 12/10/2019   22:18:47   (  -0.01,-137.17) (   0.93,-132.91)  484.78                80
 12/12/2019   10:42:59   (   0.02,-137.16) (   0.20,-138.13)  109.49                80
 12/13/2019   10:21:24   (   0.01,-137.14) (  -0.82,-133.55)  410.28                80
 12/14/2019   22:45:42   (  -0.02,-137.11) (  -0.40,-138.77)  189.64                80
 12/15/2019   22:24:06   (  -0.01,-137.09) (   0.63,-134.20)  329.61                80
 12/17/2019   10:48:18   (   0.02,-137.07) (   0.56,-139.40)  266.02                80
 12/18/2019   10:26:42   (   0.01,-137.05) (  -0.46,-134.82)  252.93                80
 12/19/2019   22:51:02   (  -0.02,-137.00) (  -0.69,-140.06)  347.91                80
 12/20/2019   22:29:26   (  -0.01,-136.98) (   0.33,-135.48)  170.84                80