Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/07/2021   10:52:35   (   0.01,-137.17) (   0.26,-138.39)  138.81                80
 06/08/2021   10:30:58   (   0.00,-137.16) (  -0.78,-133.81)  383.05                80
 06/09/2021   22:55:14   (  -0.00,-137.14) (  -0.40,-139.02)  212.94                80
 06/10/2021   22:33:37   (   0.00,-137.13) (   0.64,-134.43)  308.49                80
 06/12/2021   10:57:43   (  -0.00,-137.10) (   0.57,-139.59)  284.15                80
 06/13/2021   10:36:05   (  -0.01,-137.08) (  -0.48,-135.01)  236.80                80
 06/14/2021   22:57:42   (   0.00,-137.05) (  -0.71,-140.22)  360.60                80
 06/15/2021   22:41:24   (   0.01,-137.03) (   0.34,-135.63)  160.16                80
 06/17/2021   11:02:51   (  -0.00,-137.00) (   0.86,-140.79)  433.34                80
 06/18/2021   10:41:13   (  -0.00,-136.97) (  -0.18,-136.21)   87.06                80
 06/20/2021   22:46:31   (   0.00,-136.90) (  -0.01,-136.82)    9.16                80