Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/05/2021   10:54:18   (   0.00,-137.22) (   0.59,-139.74)  287.85                80
 01/06/2021   10:32:41   (   0.00,-137.23) (  -0.47,-135.16)  235.58                80
 01/07/2021   22:54:18   (   0.00,-137.24) (  -0.68,-140.38)  357.83                80
 01/08/2021   22:38:01   (   0.00,-137.24) (   0.32,-135.79)  165.14                80
 01/10/2021   10:59:30   (  -0.01,-137.24) (   0.82,-140.98)  425.90                80
 01/11/2021   10:37:53   (  -0.01,-137.24) (  -0.18,-136.39)   96.50                80
 01/12/2021   22:59:30   (   0.02,-137.24) (  -0.97,-141.61)  498.57                80
 01/13/2021   22:43:14   (   0.02,-137.24) (   0.09,-137.03)   23.71                80
 01/16/2021   10:45:45   (  -0.03,-137.23) (   0.05,-137.63)   45.84                80
 01/17/2021   10:24:08   (  -0.03,-137.22) (  -0.96,-133.04)  476.30                80