Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/04/2021   11:01:10   (   0.04,-137.20) (   0.77,-140.46)  371.88                80
 09/05/2021   10:44:51   (   0.04,-137.19) (  -0.23,-135.86)  150.83                80
 09/06/2021   23:03:47   (  -0.03,-137.19) (  -0.93,-141.07)  443.41                80
 09/07/2021   22:47:29   (  -0.03,-137.18) (   0.14,-136.49)   79.11                80
 09/10/2021   10:49:58   (   0.03,-137.15) (   0.03,-137.06)    9.68                80
 09/12/2021   22:49:55   (  -0.03,-137.12) (  -0.17,-137.68)   64.45                80
 09/13/2021   22:33:37   (  -0.03,-137.10) (   0.89,-133.09)  456.80                80
 09/15/2021   10:52:25   (   0.02,-137.06) (   0.27,-138.27)  136.99                80
 09/16/2021   10:36:06   (   0.01,-137.04) (  -0.74,-133.67)  383.76                80