Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 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)
 09/07/2021   22:47:29   (  -0.04,-137.20) (   0.12,-136.48)   82.07                80
 09/10/2021   10:49:59   (   0.04,-137.20) (  -0.01,-137.07)   15.99                80
 09/12/2021   22:49:56   (  -0.04,-137.19) (  -0.14,-137.68)   56.03                80
 09/13/2021   22:33:37   (  -0.04,-137.18) (   0.87,-133.09)  466.26                80
 09/15/2021   10:52:24   (   0.03,-137.17) (   0.30,-138.26)  125.36                80
 09/16/2021   10:36:07   (   0.02,-137.15) (  -0.77,-133.68)  396.50                80
 09/17/2021   22:55:02   (  -0.01,-137.13) (  -0.39,-138.89)  199.57                80
 09/18/2021   22:38:44   (  -0.01,-137.12) (   0.61,-134.29)  322.28                80
 09/20/2021   10:57:31   (   0.01,-137.10) (   0.55,-139.46)  269.50                80