Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/19/2020   22:16:38   (  -0.11,-128.25) (  -0.59,-130.41)  246.21                80
 12/20/2020   21:55:01   (  -0.08,-128.26) (   0.46,-125.83)  276.37                80
 12/22/2020   10:19:10   (   0.12,-128.25) (   0.77,-131.01)  315.13                80
 12/23/2020   09:57:33   (   0.10,-128.25) (  -0.29,-126.43)  207.63                80
 12/24/2020   22:21:50   (  -0.14,-128.29) (  -0.92,-131.64)  382.52                80
 12/25/2020   22:00:13   (  -0.12,-128.29) (   0.14,-127.06)  139.68                80
 12/27/2020   10:24:22   (   0.17,-128.26) (   1.03,-132.24)  453.10                80
 12/28/2020   10:02:45   (   0.14,-128.26) (   0.04,-127.65)   68.97                80
 12/30/2020   22:08:05   (  -0.17,-128.28) (  -0.18,-128.28)    1.29                80