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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2021   22:49:01   (   0.01,-137.19) (   0.23,-136.08)  125.79                80
 12/19/2021   11:08:42   (  -0.01,-137.19) (   0.96,-141.48)  489.40                80
 12/20/2021   10:53:00   (  -0.00,-137.18) (  -0.04,-137.03)   16.38                80
 12/22/2021   22:54:28   (  -0.00,-137.13) (  -0.21,-138.01)  100.11                80
 12/23/2021   22:38:45   (  -0.00,-137.12) (   0.79,-133.56)  405.24                80
 12/25/2021   10:58:27   (  -0.00,-137.10) (   0.41,-138.96)  211.27                80
 12/26/2021   10:42:44   (  -0.00,-137.08) (  -0.58,-134.51)  293.66                80
 12/27/2021   23:02:34   (   0.00,-137.05) (  -0.65,-139.94)  329.50                80
 12/28/2021   22:46:52   (  -0.00,-137.02) (   0.36,-135.49)  175.17                80
 12/30/2021   11:06:33   (   0.00,-137.00) (   0.86,-140.88)  442.48                80