Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/27/2021   23:02:35   (   0.03,-137.21) (  -0.59,-139.95)  312.21                80
 12/28/2021   22:46:53   (   0.02,-137.20) (   0.42,-135.50)  194.42                80
 12/30/2021   11:06:34   (  -0.02,-137.19) (   0.79,-140.89)  420.95                80
 12/31/2021   10:50:51   (  -0.01,-137.18) (  -0.15,-136.43)   85.08                80
 01/02/2022   22:52:19   (  -0.01,-137.15) (  -0.06,-137.42)   30.51                80
 01/03/2022   22:36:36   (  -0.01,-137.13) (   0.95,-132.97)  474.89                80
 01/05/2022   10:58:57   (   0.01,-137.11) (   0.27,-138.36)  142.09                80
 01/06/2022   10:37:54   (   0.01,-137.09) (  -0.68,-133.90)  363.10                80
 01/07/2022   23:00:24   (  -0.01,-137.06) (  -0.52,-139.33)  258.78                80
 01/08/2022   22:44:42   (  -0.01,-137.05) (   0.49,-134.89)  246.37                80