Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 1 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/31/2021   11:01:19   (  -0.00,-137.24) (   0.92,-141.30)  463.57                80
 02/01/2021   10:39:43   (  -0.00,-137.24) (  -0.14,-136.72)   59.65                80
 02/03/2021   22:42:23   (   0.00,-137.24) (  -0.03,-137.35)   12.56                80
 02/06/2021   10:47:33   (  -0.01,-137.24) (   0.17,-137.94)   80.36                80
 02/07/2021   10:25:57   (  -0.01,-137.24) (  -0.89,-133.37)  441.63                80
 02/08/2021   22:47:34   (   0.02,-137.22) (  -0.29,-138.58)  155.25                80
 02/09/2021   22:31:17   (   0.02,-137.21) (   0.72,-133.99)  366.56                80
 02/11/2021   10:52:45   (  -0.02,-137.21) (   0.42,-139.18)  224.49                80
 02/12/2021   10:31:08   (  -0.02,-137.20) (  -0.58,-134.59)  297.20                80