Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2021   22:46:52   (   0.03,-137.22) (   0.39,-135.49)  195.81                80
 12/30/2021   11:06:34   (  -0.02,-137.22) (   0.82,-140.89)  418.49                80
 12/31/2021   10:50:51   (  -0.01,-137.21) (  -0.19,-136.44)   88.12                80
 01/02/2022   22:52:18   (  -0.00,-137.19) (  -0.08,-137.41)   26.13                80
 01/03/2022   22:36:36   (  -0.01,-137.18) (   0.92,-132.96)  480.09                80
 01/05/2022   10:56:17   (   0.01,-137.17) (   0.29,-138.36)  135.79                80
 01/06/2022   10:37:54   (   0.01,-137.16) (  -0.72,-133.91)  370.01                80
 01/07/2022   23:00:25   (  -0.01,-137.13) (  -0.48,-139.34)  251.03                80
 01/08/2022   22:44:41   (  -0.01,-137.12) (   0.48,-134.88)  254.76                80
 01/10/2022   11:04:22   (   0.01,-137.11) (   0.75,-140.27)  361.48                80