Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 24.  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)  199.61                80
 12/26/2021   10:42:45   (  -0.02,-137.21) (  -0.65,-134.52)  307.14                80
 12/27/2021   23:02:35   (   0.03,-137.20) (  -0.58,-139.95)  313.07                80
 12/28/2021   22:46:53   (   0.02,-137.19) (   0.42,-135.50)  193.39                80
 12/30/2021   11:06:33   (  -0.02,-137.19) (   0.84,-140.88)  421.83                80
 12/31/2021   10:50:51   (  -0.01,-137.18) (  -0.16,-136.43)   83.97                80
 01/02/2022   22:52:19   (  -0.01,-137.13) (  -0.05,-137.42)   32.62                80
 01/03/2022   22:36:36   (  -0.01,-137.11) (   0.95,-132.97)  472.63                80
 01/05/2022   10:58:58   (   0.01,-137.09) (   0.27,-138.36)  144.20                80
 01/06/2022   10:37:54   (   0.01,-137.07) (  -0.68,-133.90)  360.79                80