Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2021   11:00:36   (  -0.02,-137.21) (   0.52,-139.55)  266.73                80
 12/15/2021   10:44:53   (  -0.01,-137.21) (  -0.48,-135.11)  239.96                80
 12/16/2021   23:04:44   (   0.01,-137.20) (  -0.72,-140.54)  380.61                80
 12/17/2021   22:49:02   (   0.00,-137.19) (   0.28,-136.09)  125.72                80
 12/19/2021   11:08:42   (  -0.00,-137.18) (   0.98,-141.48)  489.54                80
 12/20/2021   10:53:00   (   0.00,-137.17) (  -0.02,-137.03)   16.22                80
 12/22/2021   22:54:28   (  -0.01,-137.13) (  -0.23,-138.01)  100.50                80
 12/23/2021   22:38:45   (  -0.01,-137.12) (   0.77,-133.56)  404.78                80
 12/25/2021   10:58:26   (   0.01,-137.10) (   0.44,-138.95)  211.86                80
 12/26/2021   10:42:44   (   0.01,-137.08) (  -0.56,-134.51)  293.02                80