Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 7 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/26/2021   23:00:47   (  -0.04,-137.15) (  -0.84,-140.66)  399.47                80
 07/27/2021   22:44:30   (  -0.03,-137.15) (   0.22,-136.07)  122.65                80
 07/29/2021   11:05:57   (   0.03,-137.13) (   0.94,-141.25)  469.18                80
 07/30/2021   10:44:19   (   0.03,-137.11) (  -0.05,-136.65)   52.59                80
 08/01/2021   22:46:57   (  -0.03,-137.08) (  -0.10,-137.27)   22.37                80
 08/02/2021   22:30:39   (  -0.02,-137.06) (   0.96,-132.68)  498.93                80
 08/04/2021   10:52:07   (  -0.01,-137.03) (   0.16,-137.87)   95.40                80
 08/05/2021   10:30:29   (  -0.02,-137.00) (  -0.83,-133.27)  425.21                80
 08/06/2021   22:52:04   (   0.01,-136.97) (  -0.35,-138.47)  172.45                80
 08/07/2021   22:35:47   (   0.01,-136.94) (   0.70,-133.89)  348.00                80