Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2021   10:53:01   (  -0.01,-137.20) (  -0.07,-137.04)   19.41                80
 12/22/2021   22:54:28   (   0.01,-137.18) (  -0.18,-138.02)   95.00                80
 12/23/2021   22:38:46   (   0.01,-137.18) (   0.82,-133.57)  411.19                80
 12/25/2021   10:58:27   (  -0.01,-137.17) (   0.39,-138.96)  204.14                80
 12/26/2021   10:42:45   (  -0.01,-137.16) (  -0.61,-134.52)  301.64                80
 12/27/2021   23:02:35   (   0.02,-137.13) (  -0.62,-139.94)  320.19                80
 12/28/2021   22:46:53   (   0.01,-137.12) (   0.38,-135.49)  185.33                80
 12/30/2021   11:06:34   (  -0.01,-137.10) (   0.84,-140.89)  431.06                80
 12/31/2021   10:50:51   (   0.00,-137.08) (  -0.16,-136.44)   73.79                80
 01/02/2022   22:52:18   (  -0.01,-137.01) (  -0.12,-137.41)   45.56                80