Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2020   22:42:01   (   0.01,-137.21) (  -0.08,-137.56)   40.80                80
 12/08/2020   22:25:44   (   0.01,-137.20) (   0.97,-132.98)  481.15                80
 12/10/2020   10:44:34   (  -0.01,-137.20) (   0.20,-138.17)  110.97                80
 12/11/2020   10:28:16   (  -0.00,-137.19) (  -0.78,-133.58)  410.53                80
 12/12/2020   22:47:13   (   0.00,-137.16) (  -0.37,-138.80)  186.66                80
 12/13/2020   22:30:57   (  -0.00,-137.15) (   0.68,-134.22)  334.42                80
 12/15/2020   10:49:46   (   0.01,-137.13) (   0.49,-139.41)  259.01                80
 12/16/2020   10:30:49   (   0.01,-137.11) (  -0.49,-134.81)  261.56                80
 12/17/2020   22:52:26   (  -0.01,-137.08) (  -0.65,-140.04)  336.91                80
 12/18/2020   22:36:09   (  -0.01,-137.06) (   0.34,-135.44)  183.54                80