Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/28/2021   22:48:56   (  -0.04,-137.21) (   0.06,-136.67)   61.08                80
 10/01/2021   10:48:44   (   0.03,-137.19) (   0.06,-137.25)    7.79                80
 10/03/2021   22:51:22   (  -0.02,-137.16) (  -0.17,-137.87)   80.69                80
 10/04/2021   22:35:04   (  -0.02,-137.15) (   0.84,-133.27)  441.37                80
 10/06/2021   10:53:50   (   0.01,-137.13) (   0.33,-138.44)  150.60                80
 10/07/2021   10:37:33   (   0.02,-137.11) (  -0.74,-133.86)  371.10                80
 10/08/2021   22:56:28   (  -0.02,-137.08) (  -0.45,-139.06)  225.43                80
 10/09/2021   22:40:09   (  -0.02,-137.06) (   0.57,-134.47)  295.67                80
 10/11/2021   10:58:56   (   0.02,-137.02) (   0.61,-139.63)  297.95                80