Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 9 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/23/2021   22:43:50   (  -0.04,-137.20) (   0.35,-135.48)  196.46                80
 09/25/2021   11:02:37   (   0.04,-137.20) (   0.79,-140.66)  393.52                80
 09/26/2021   10:46:19   (   0.04,-137.19) (  -0.23,-136.06)  129.14                80
 09/27/2021   23:05:14   (  -0.03,-137.17) (  -0.95,-141.26)  466.30                80
 09/28/2021   22:48:56   (  -0.03,-137.16) (   0.06,-136.67)   55.88                80
 10/01/2021   10:48:44   (   0.02,-137.13) (   0.06,-137.25)   14.03                80
 10/03/2021   22:51:22   (  -0.01,-137.09) (  -0.17,-137.87)   89.33                80
 10/04/2021   22:35:04   (  -0.01,-137.07) (   0.85,-133.28)  432.08                80
 10/06/2021   10:53:50   (   0.01,-137.04) (   0.34,-138.45)  160.29                80