Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 10 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)
 10/06/2021   10:53:50   (   0.03,-137.23) (   0.32,-138.44)  137.90                80
 10/07/2021   10:37:32   (   0.04,-137.25) (  -0.75,-133.86)  387.02                80
 10/08/2021   22:56:28   (  -0.04,-137.26) (  -0.43,-139.06)  204.52                80
 10/09/2021   22:40:09   (  -0.04,-137.27) (   0.58,-134.46)  319.75                80
 10/11/2021   10:58:56   (   0.03,-137.28) (   0.58,-139.63)  269.19                80
 10/12/2021   10:42:38   (   0.03,-137.28) (  -0.50,-135.05)  254.48                80
 10/13/2021   23:01:33   (  -0.02,-137.28) (  -0.69,-140.25)  338.79                80
 10/14/2021   22:45:15   (  -0.02,-137.28) (   0.33,-135.66)  184.65                80
 10/16/2021   11:04:01   (   0.01,-137.28) (   0.83,-140.83)  404.99                80
 10/17/2021   10:47:44   (   0.01,-137.28) (  -0.25,-136.25)  118.50                80
 10/18/2021   23:06:39   (  -0.01,-137.28) (  -0.94,-141.45)  474.93                80
 10/19/2021   22:50:21   (  -0.01,-137.28) (   0.08,-136.86)   48.38                80