Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 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)
 12/25/2021   10:58:28   (  -0.03,-137.21) (   0.35,-138.97)  199.55                80
 12/26/2021   10:42:45   (  -0.02,-137.21) (  -0.65,-134.52)  307.25                80
 12/27/2021   23:02:35   (   0.03,-137.20) (  -0.58,-139.95)  312.76                80
 12/28/2021   22:46:53   (   0.02,-137.20) (   0.42,-135.50)  193.75                80
 12/30/2021   11:06:34   (  -0.02,-137.19) (   0.79,-140.89)  421.50                80
 12/31/2021   10:50:51   (  -0.01,-137.18) (  -0.15,-136.43)   84.38                80
 01/02/2022   22:52:19   (  -0.01,-137.13) (  -0.06,-137.42)   31.93                80
 01/03/2022   22:36:36   (  -0.01,-137.12) (   0.94,-132.97)  473.32                80
 01/05/2022   10:58:57   (   0.01,-137.10) (   0.28,-138.36)  143.52                80
 01/06/2022   10:37:55   (   0.01,-137.08) (  -0.72,-133.91)  361.50                80
 01/07/2022   23:00:24   (  -0.01,-137.05) (  -0.53,-139.33)  260.95                80