Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 19.  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   (  -0.02,-137.21) (   0.93,-141.48)  487.22                80
 12/20/2021   10:53:00   (  -0.01,-137.21) (  -0.07,-137.04)   19.57                80
 12/22/2021   22:54:28   (   0.01,-137.19) (  -0.18,-138.02)   94.70                80
 12/23/2021   22:38:46   (   0.01,-137.18) (   0.82,-133.57)  411.56                80
 12/25/2021   10:58:27   (  -0.01,-137.18) (   0.38,-138.96)  203.62                80
 12/26/2021   10:42:45   (  -0.01,-137.17) (  -0.61,-134.52)  302.24                80
 12/27/2021   23:02:35   (   0.01,-137.14) (  -0.62,-139.94)  319.52                80
 12/28/2021   22:46:52   (   0.01,-137.13) (   0.38,-135.50)  186.07                80
 12/30/2021   11:06:34   (  -0.01,-137.11) (   0.83,-140.89)  430.18                80
 12/31/2021   10:50:51   (   0.00,-137.09) (  -0.17,-136.44)   74.78                80