Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 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)
 02/08/2021   22:47:34   (   0.03,-137.20) (  -0.29,-138.58)  157.12                80
 02/09/2021   22:31:17   (   0.03,-137.19) (   0.72,-133.99)  364.42                80
 02/11/2021   10:52:45   (  -0.01,-137.16) (   0.42,-139.17)  228.79                80
 02/12/2021   10:31:08   (  -0.01,-137.15) (  -0.59,-134.58)  292.50                80
 02/13/2021   22:52:45   (   0.01,-137.14) (  -0.60,-139.80)  303.43                80
 02/14/2021   22:36:27   (   0.01,-137.12) (   0.41,-135.21)  217.73                80
 02/16/2021   10:57:56   (  -0.01,-137.09) (   0.73,-140.39)  376.21                80
 02/17/2021   10:36:18   (  -0.01,-137.07) (  -0.28,-135.80)  144.54                80
 02/18/2021   22:57:56   (   0.01,-137.05) (  -0.90,-141.02)  452.43                80
 02/19/2021   22:41:38   (   0.00,-137.03) (   0.11,-136.43)   68.10                80