Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/09/2020   22:03:33   (  -0.03,-128.13) (  -0.01,-127.95)   19.99                80
 12/12/2020   10:08:46   (   0.05,-128.16) (   0.13,-128.56)   45.38                80
 12/13/2020   09:47:10   (   0.03,-128.17) (  -0.92,-123.98)  478.25                80
 12/14/2020   22:11:26   (  -0.07,-128.20) (  -0.28,-129.19)  111.73                80
 12/15/2020   21:49:49   (  -0.05,-128.21) (   0.77,-124.61)  411.27                80
 12/17/2020   10:13:58   (   0.09,-128.21) (   0.46,-129.78)  179.17                80
 12/18/2020   09:52:21   (   0.07,-128.22) (  -0.60,-125.20)  343.95                80
 12/19/2020   22:16:38   (  -0.10,-128.26) (  -0.60,-130.41)  246.06                80
 12/20/2020   21:55:01   (  -0.08,-128.27) (   0.45,-125.84)  276.80                80
 12/22/2020   10:19:10   (   0.12,-128.26) (   0.71,-131.02)  314.11                80