Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/25/2021   10:39:12   (   0.03,-137.17) (  -0.38,-135.46)  195.67                80
 07/26/2021   23:00:48   (  -0.04,-137.15) (  -0.82,-140.66)  399.58                80
 07/27/2021   22:44:30   (  -0.04,-137.14) (   0.23,-136.07)  122.61                80
 07/29/2021   11:05:56   (   0.03,-137.13) (   0.99,-141.24)  468.95                80
 07/30/2021   10:44:19   (   0.03,-137.12) (  -0.06,-136.65)   52.83                80
 08/01/2021   22:46:57   (  -0.03,-137.08) (  -0.08,-137.27)   21.97                80
 08/02/2021   22:30:39   (  -0.02,-137.06) (   0.98,-132.69)  499.22                80
 08/04/2021   10:52:07   (  -0.01,-137.03) (   0.19,-137.86)   94.78                80
 08/05/2021   10:30:29   (  -0.02,-137.01) (  -0.86,-133.27)  425.83                80
 08/06/2021   22:52:04   (   0.01,-136.97) (  -0.32,-138.48)  171.91                80