Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/19/2021   11:08:43   (  -0.01,-137.20) (   0.93,-141.48)  487.43                80
 12/20/2021   10:53:00   (  -0.01,-137.20) (  -0.07,-137.04)   19.21                80
 12/22/2021   22:54:28   (   0.00,-137.17) (  -0.18,-138.02)   95.87                80
 12/23/2021   22:38:46   (  -0.00,-137.16) (   0.82,-133.57)  410.11                80
 12/25/2021   10:58:27   (  -0.00,-137.16) (   0.38,-138.96)  205.44                80
 12/26/2021   10:42:45   (  -0.00,-137.14) (  -0.62,-134.52)  300.17                80
 12/27/2021   23:02:35   (   0.00,-137.11) (  -0.61,-139.94)  322.02                80
 12/28/2021   22:46:51   (   0.00,-137.10) (   0.33,-135.48)  183.32                80
 12/30/2021   11:06:33   (   0.00,-137.08) (   0.87,-140.88)  433.35                80
 12/31/2021   10:48:10   (   0.01,-137.06) (  -0.13,-136.43)   71.19                80