Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2020   10:00:53   (   0.01,-128.07) (  -0.14,-127.32)   84.88                80
 12/09/2020   22:03:34   (  -0.03,-128.13) (   0.03,-127.96)   19.50                80
 12/12/2020   10:08:46   (   0.05,-128.15) (   0.15,-128.55)   45.92                80
 12/13/2020   09:47:09   (   0.03,-128.17) (  -0.90,-123.97)  477.58                80
 12/14/2020   22:11:26   (  -0.07,-128.20) (  -0.31,-129.18)  112.80                80
 12/15/2020   21:49:49   (  -0.05,-128.21) (   0.74,-124.60)  410.10                80
 12/17/2020   10:13:59   (   0.09,-128.20) (   0.43,-129.79)  180.33                80
 12/18/2020   09:52:22   (   0.07,-128.21) (  -0.62,-125.21)  342.64                80
 12/19/2020   22:16:38   (  -0.10,-128.24) (  -0.58,-130.42)  247.78                80
 12/20/2020   21:55:02   (  -0.08,-128.25) (   0.47,-125.84)  274.95                80