Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2020 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2020   22:25:44   (   0.01,-137.22) (   0.93,-132.98)  483.28                80
 12/10/2020   10:44:34   (  -0.01,-137.22) (   0.18,-138.17)  107.91                80
 12/11/2020   10:28:17   (  -0.01,-137.22) (  -0.81,-133.58)  414.33                80
 12/12/2020   22:47:14   (   0.00,-137.21) (  -0.34,-138.80)  181.68                80
 12/13/2020   22:30:56   (  -0.00,-137.20) (   0.66,-134.21)  340.11                80
 12/15/2020   10:49:46   (   0.00,-137.19) (   0.51,-139.40)  252.34                80
 12/16/2020   10:33:29   (   0.01,-137.18) (  -0.54,-134.82)  268.94                80
 12/17/2020   22:52:25   (  -0.01,-137.15) (  -0.66,-140.03)  328.30                80
 12/18/2020   22:36:09   (  -0.01,-137.14) (   0.39,-135.45)  192.85                80
 12/20/2020   10:57:38   (   0.01,-137.12) (   0.78,-140.64)  400.12                80
 12/21/2020   10:36:01   (   0.01,-137.11) (  -0.22,-136.05)  120.85                80