Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 10/22/2021   10:50:07   (   0.03,-137.21) (   0.10,-137.41)   23.97                80
 10/24/2021   22:52:45   (  -0.03,-137.21) (  -0.21,-138.03)   93.57                80
 10/25/2021   22:36:27   (  -0.03,-137.21) (   0.81,-133.44)  429.97                80
 10/27/2021   10:55:13   (   0.02,-137.21) (   0.33,-138.61)  158.85                80
 10/28/2021   10:38:55   (   0.02,-137.21) (  -0.70,-134.02)  364.22                80
 10/29/2021   22:57:50   (  -0.01,-137.20) (  -0.49,-139.22)  230.96                80
 10/30/2021   22:41:31   (  -0.01,-137.19) (   0.54,-134.62)  291.90                80
 11/01/2021   11:00:18   (   0.01,-137.19) (   0.60,-139.80)  297.79                80
 11/02/2021   10:43:59   (   0.01,-137.18) (  -0.42,-135.20)  224.73                80
 11/03/2021   23:02:55   (  -0.01,-137.15) (  -0.75,-140.41)  371.37                80