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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2020   10:08:46   (   0.05,-128.16) (   0.16,-128.55)   45.24                80
 12/13/2020   09:47:09   (   0.03,-128.17) (  -0.89,-123.97)  478.50                80
 12/14/2020   22:11:25   (  -0.07,-128.21) (  -0.31,-129.18)  111.22                80
 12/15/2020   21:49:49   (  -0.05,-128.22) (   0.74,-124.60)  411.86                80
 12/17/2020   10:13:58   (   0.09,-128.22) (   0.43,-129.79)  178.69                80
 12/18/2020   09:52:22   (   0.07,-128.23) (  -0.62,-125.21)  344.49                80
 12/19/2020   22:16:38   (  -0.11,-128.26) (  -0.58,-130.42)  245.17                80
 12/20/2020   21:55:02   (  -0.08,-128.27) (   0.47,-125.84)  277.73                80
 12/22/2020   10:19:10   (   0.12,-128.27) (   0.75,-131.01)  313.32                80
 12/23/2020   09:57:33   (   0.10,-128.28) (  -0.30,-126.43)  209.73                80
 12/24/2020   22:21:50   (  -0.14,-128.31) (  -0.89,-131.64)  379.91                80
 12/25/2020   22:00:13   (  -0.12,-128.32) (   0.16,-127.07)  142.59                80