Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/19/2021   22:41:39   (   0.04,-137.20) (   0.18,-136.44)   85.33                80
 02/22/2021   10:41:30   (  -0.03,-137.17) (  -0.06,-137.04)   14.85                80
 02/24/2021   22:44:10   (   0.01,-137.13) (  -0.12,-137.66)   61.44                80
 02/25/2021   22:27:53   (   0.01,-137.11) (   0.89,-133.07)  459.47                80
 02/27/2021   10:49:21   (  -0.00,-137.08) (   0.25,-138.26)  133.74                80
 02/28/2021   10:27:43   (  -0.01,-137.06) (  -0.76,-133.67)  386.59                80
 03/01/2021   22:49:21   (   0.01,-137.02) (  -0.41,-138.88)  212.26                80
 03/02/2021   22:33:03   (   0.01,-137.00) (   0.60,-134.29)  307.78                80
 03/04/2021   10:54:32   (  -0.01,-136.96) (   0.55,-139.48)  286.66                80