Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/24/2021   11:00:50   (   0.03,-137.18) (   0.67,-140.04)  326.42                80
 07/25/2021   10:39:11   (   0.03,-137.17) (  -0.33,-135.45)  195.73                80
 07/26/2021   23:00:48   (  -0.04,-137.15) (  -0.82,-140.66)  399.58                80
 07/27/2021   22:44:29   (  -0.04,-137.15) (   0.18,-136.06)  122.68                80
 07/29/2021   11:05:56   (   0.04,-137.13) (   0.98,-141.24)  468.69                80
 07/30/2021   10:44:19   (   0.03,-137.12) (  -0.07,-136.65)   53.12                80
 08/01/2021   22:46:57   (  -0.03,-137.08) (  -0.06,-137.27)   21.67                80
 08/02/2021   22:30:38   (  -0.02,-137.06) (   0.94,-132.68)  499.60                80
 08/04/2021   10:52:07   (  -0.01,-137.04) (   0.17,-137.86)   94.11                80
 08/05/2021   10:30:29   (  -0.02,-137.01) (  -0.88,-133.28)  426.47                80