Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 2 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 02/01/2021   10:39:43   (  -0.03,-137.24) (  -0.13,-136.72)   59.14                80
 02/03/2021   22:42:23   (   0.03,-137.24) (   0.01,-137.36)   13.73                80
 02/06/2021   10:47:34   (  -0.02,-137.22) (   0.13,-137.95)   83.45                80
 02/07/2021   10:25:57   (   0.01,-137.20) (  -0.88,-133.36)  438.59                80
 02/08/2021   22:47:34   (  -0.01,-137.19) (  -0.31,-138.58)  158.24                80
 02/09/2021   22:31:17   (  -0.01,-137.17) (   0.70,-133.99)  362.93                80
 02/11/2021   10:52:45   (   0.01,-137.15) (   0.45,-139.17)  229.89                80
 02/12/2021   10:31:07   (   0.00,-137.14) (  -0.56,-134.58)  291.13                80
 02/13/2021   22:52:45   (  -0.00,-137.11) (  -0.62,-139.80)  306.30                80
 02/14/2021   22:36:28   (  -0.00,-137.10) (   0.44,-135.22)  214.74                80