Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/13/2020   09:47:09   (   0.03,-128.17) (  -0.90,-123.97)  478.47                80
 12/14/2020   22:11:26   (  -0.07,-128.21) (  -0.30,-129.18)  111.19                80
 12/15/2020   21:49:49   (  -0.05,-128.22) (   0.75,-124.60)  411.85                80
 12/17/2020   10:13:58   (   0.09,-128.21) (   0.42,-129.79)  178.76                80
 12/18/2020   09:52:22   (   0.07,-128.23) (  -0.63,-125.21)  344.45                80
 12/19/2020   22:16:38   (  -0.11,-128.26) (  -0.56,-130.42)  245.18                80
 12/20/2020   21:55:02   (  -0.08,-128.27) (   0.49,-125.84)  277.74                80
 12/22/2020   10:19:10   (   0.12,-128.26) (   0.73,-131.01)  313.37                80
 12/23/2020   09:57:34   (   0.10,-128.27) (  -0.32,-126.44)  209.68                80
 12/24/2020   22:21:50   (  -0.14,-128.31) (  -0.87,-131.65)  379.90                80
 12/25/2020   22:00:13   (  -0.12,-128.32) (   0.19,-127.07)  142.64                80