Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/05/2021   10:44:52   (   0.05,-137.19) (  -0.28,-135.87)  151.29                80
 09/06/2021   23:03:46   (  -0.04,-137.19) (  -0.94,-141.07)  442.96                80
 09/07/2021   22:47:29   (  -0.04,-137.18) (   0.12,-136.48)   79.57                80
 09/10/2021   10:47:18   (   0.04,-137.15) (   0.04,-137.06)   10.30                80
 09/12/2021   22:49:55   (  -0.04,-137.12) (  -0.19,-137.67)   64.03                80
 09/13/2021   22:33:37   (  -0.04,-137.10) (   0.87,-133.09)  457.26                80
 09/15/2021   10:52:24   (   0.03,-137.06) (   0.29,-138.26)  136.42                80
 09/16/2021   10:36:06   (   0.02,-137.04) (  -0.72,-133.67)  384.35                80
 09/17/2021   22:55:01   (  -0.01,-137.01) (  -0.44,-138.88)  212.93                80
 09/18/2021   22:38:44   (  -0.01,-136.99) (   0.63,-134.29)  307.88                80