Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 1.  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   (   0.00,-137.20) (  -0.01,-137.19)    1.55                80
 06/04/2021   22:50:06   (  -0.01,-137.19) (  -0.13,-137.81)   69.79                80
 06/05/2021   22:28:28   (  -0.00,-137.19) (   0.91,-133.22)  453.08                80
 06/07/2021   10:52:36   (   0.00,-137.19) (   0.25,-138.40)  137.11                80
 06/08/2021   10:30:57   (  -0.00,-137.18) (  -0.74,-133.80)  385.23                80
 06/09/2021   22:52:34   (   0.00,-137.17) (  -0.38,-139.02)  210.49                80
 06/10/2021   22:36:16   (   0.01,-137.16) (   0.60,-134.42)  311.48                80
 06/12/2021   10:57:43   (  -0.01,-137.14) (   0.55,-139.60)  280.03                80
 06/13/2021   10:36:06   (  -0.01,-137.13) (  -0.50,-135.01)  241.45                80
 06/14/2021   22:57:42   (   0.00,-137.10) (  -0.68,-140.22)  355.67                80