Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2021   22:54:28   (   0.02,-137.20) (  -0.18,-138.02)   92.89                80
 12/23/2021   22:38:46   (   0.01,-137.20) (   0.82,-133.57)  413.91                80
 12/25/2021   10:58:27   (  -0.02,-137.20) (   0.38,-138.96)  200.51                80
 12/26/2021   10:42:45   (  -0.02,-137.20) (  -0.62,-134.52)  305.90                80
 12/27/2021   23:02:35   (   0.02,-137.18) (  -0.62,-139.94)  314.92                80
 12/28/2021   22:46:53   (   0.01,-137.17) (   0.38,-135.50)  191.23                80
 12/30/2021   11:06:34   (  -0.01,-137.17) (   0.83,-140.89)  424.23                80
 12/31/2021   10:50:51   (  -0.00,-137.15) (  -0.17,-136.44)   81.24                80
 01/02/2022   22:52:18   (  -0.01,-137.10) (  -0.10,-137.41)   36.44                80
 01/03/2022   22:36:36   (  -0.01,-137.08) (   0.90,-132.96)  468.41                80