Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2021   22:38:46   (   0.02,-137.21) (   0.84,-133.57)  414.49                80
 12/25/2021   10:58:27   (  -0.02,-137.21) (   0.36,-138.97)  199.70                80
 12/26/2021   10:42:45   (  -0.02,-137.21) (  -0.64,-134.52)  307.00                80
 12/27/2021   23:02:35   (   0.03,-137.20) (  -0.60,-139.95)  313.26                80
 12/28/2021   22:46:53   (   0.02,-137.19) (   0.41,-135.50)  193.16                80
 12/30/2021   11:06:34   (  -0.02,-137.19) (   0.80,-140.89)  422.09                80
 12/31/2021   10:50:52   (  -0.01,-137.17) (  -0.20,-136.45)   83.69                80
 01/02/2022   22:52:18   (  -0.01,-137.13) (  -0.07,-137.42)   32.97                80
 01/03/2022   22:36:36   (  -0.01,-137.11) (   0.93,-132.97)  472.19                80
 01/05/2022   10:58:57   (   0.01,-137.09) (   0.29,-138.36)  144.64                80