Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/25/2021   11:02:37   (   0.04,-137.22) (   0.80,-140.65)  391.14                80
 09/26/2021   10:46:18   (   0.04,-137.22) (  -0.21,-136.05)  132.36                80
 09/27/2021   23:05:14   (  -0.04,-137.21) (  -0.97,-141.26)  461.65                80
 09/28/2021   22:48:56   (  -0.04,-137.21) (   0.10,-136.68)   61.36                80
 10/01/2021   10:51:25   (   0.03,-137.20) (   0.02,-137.26)    6.83                80
 10/03/2021   22:51:22   (  -0.02,-137.17) (  -0.19,-137.87)   79.50                80
 10/04/2021   22:35:04   (  -0.02,-137.16) (   0.89,-133.29)  442.76                80
 10/06/2021   10:53:51   (   0.01,-137.15) (   0.29,-138.45)  148.48                80
 10/07/2021   10:37:32   (   0.02,-137.13) (  -0.72,-133.86)  373.39                80
 10/08/2021   22:56:28   (  -0.02,-137.10) (  -0.46,-139.06)  223.32                80