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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/06/2021   22:40:18   (  -0.03,-137.18) (   0.28,-135.86)  151.03                80
 07/08/2021   11:04:24   (   0.02,-137.19) (   0.92,-141.02)  437.84                80
 07/09/2021   10:42:47   (   0.01,-137.19) (  -0.13,-136.44)   85.26                80
 07/11/2021   22:45:26   (  -0.01,-137.18) (   0.01,-137.06)   13.52                80
 07/14/2021   10:50:35   (   0.01,-137.17) (   0.14,-137.64)   53.77                80
 07/15/2021   10:28:57   (   0.02,-137.17) (  -0.91,-133.06)  468.77                80
 07/16/2021   22:53:13   (  -0.02,-137.15) (  -0.25,-138.27)  126.72                80
 07/17/2021   22:31:35   (  -0.01,-137.14) (   0.75,-133.67)  395.26                80
 07/19/2021   10:55:42   (   0.00,-137.12) (   0.40,-138.85)  196.62                80