Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2020   10:22:30   (   0.03,-128.04) (   0.92,-131.90)  439.40                80
 12/07/2020   10:00:53   (   0.01,-128.07) (  -0.13,-127.32)   84.83                80
 12/09/2020   22:03:34   (  -0.03,-128.12) (   0.02,-127.96)   19.05                80
 12/12/2020   10:08:46   (   0.05,-128.15) (   0.17,-128.55)   46.39                80
 12/13/2020   09:47:10   (   0.03,-128.16) (  -0.94,-123.98)  477.14                80
 12/14/2020   22:11:27   (  -0.07,-128.19) (  -0.27,-129.19)  113.47                80
 12/15/2020   21:49:50   (  -0.05,-128.20) (   0.78,-124.61)  409.40                80
 12/17/2020   10:13:58   (   0.09,-128.20) (   0.46,-129.79)  181.02                80
 12/18/2020   09:52:22   (   0.07,-128.21) (  -0.59,-125.21)  341.89                80
 12/19/2020   22:16:38   (  -0.10,-128.24) (  -0.61,-130.42)  248.76                80