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,-137.22) (  -0.29,-138.58)  155.09                80
 02/09/2021   22:31:18   (   0.03,-137.22) (   0.77,-134.00)  368.09                80
 02/11/2021   10:52:45   (  -0.01,-137.22) (   0.42,-139.17)  222.22                80
 02/12/2021   10:31:07   (  -0.01,-137.22) (  -0.58,-134.58)  300.77                80
 02/13/2021   22:55:26   (   0.01,-137.23) (  -0.54,-139.81)  292.96                80
 02/14/2021   22:33:48   (   0.01,-137.23) (   0.47,-135.22)  229.85                80
 02/16/2021   10:57:56   (  -0.01,-137.23) (   0.73,-140.39)  361.20                80
 02/17/2021   10:36:19   (  -0.01,-137.23) (  -0.34,-135.81)  161.25                80
 02/18/2021   22:57:56   (   0.01,-137.23) (  -0.84,-141.03)  433.46                80
 02/19/2021   22:41:39   (   0.00,-137.22) (   0.17,-136.44)   88.66                80
 02/22/2021   10:41:30   (   0.01,-137.19) (  -0.05,-137.04)   18.10                80