Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 21.  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   (   0.01,-137.20) (  -0.18,-138.02)   93.09                80
 12/23/2021   22:38:46   (   0.01,-137.20) (   0.82,-133.57)  413.66                80
 12/25/2021   10:58:27   (  -0.02,-137.20) (   0.38,-138.96)  200.73                80
 12/26/2021   10:42:45   (  -0.02,-137.20) (  -0.61,-134.51)  305.62                80
 12/27/2021   23:02:35   (   0.02,-137.18) (  -0.62,-139.94)  315.44                80
 12/28/2021   22:46:53   (   0.01,-137.17) (   0.38,-135.49)  190.65                80
 12/30/2021   11:06:34   (  -0.01,-137.16) (   0.84,-140.89)  424.81                80
 12/31/2021   10:50:51   (   0.00,-137.15) (  -0.16,-136.44)   80.58                80
 01/02/2022   22:52:19   (  -0.01,-137.09) (  -0.06,-137.42)   37.44                80
 01/03/2022   22:36:36   (  -0.01,-137.07) (   0.89,-132.96)  467.38                80