Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/02/2021   10:44:47   (   0.01,-137.19) (  -0.02,-137.19)    3.29                80
 06/04/2021   22:50:06   (  -0.01,-137.19) (  -0.12,-137.81)   70.37                80
 06/05/2021   22:28:28   (  -0.00,-137.19) (   0.86,-133.21)  452.37                80
 06/07/2021   10:52:35   (   0.00,-137.18) (   0.29,-138.39)  138.14                80
 06/08/2021   10:30:57   (  -0.00,-137.17) (  -0.75,-133.80)  383.98                80
 06/09/2021   22:52:34   (   0.00,-137.16) (  -0.44,-139.01)  211.88                80
 06/10/2021   22:36:16   (   0.01,-137.15) (   0.61,-134.42)  309.85                80
 06/12/2021   10:57:44   (  -0.01,-137.13) (   0.55,-139.60)  282.06                80
 06/13/2021   10:36:06   (  -0.01,-137.11) (  -0.50,-135.01)  239.17                80
 06/14/2021   22:57:42   (   0.01,-137.08) (  -0.69,-140.22)  358.16                80
 06/15/2021   22:41:25   (   0.01,-137.06) (   0.36,-135.64)  162.92                80