Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 12 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2020   22:00:14   (  -0.12,-128.28) (   0.17,-127.06)  139.13                80
 12/27/2020   10:24:22   (   0.17,-128.25) (   1.04,-132.24)  453.93                80
 12/28/2020   10:02:45   (   0.14,-128.25) (  -0.01,-127.66)   67.91                80
 12/30/2020   22:08:04   (  -0.17,-128.26) (  -0.19,-128.28)    2.97                80
 01/02/2021   10:10:36   (   0.19,-128.21) (   0.35,-128.87)   75.81                80
 01/03/2021   09:49:00   (   0.16,-128.20) (  -0.71,-124.29)  445.10                80
 01/04/2021   22:13:16   (  -0.21,-128.21) (  -0.49,-129.50)  147.30                80
 01/05/2021   21:51:39   (  -0.18,-128.20) (   0.57,-124.93)  373.26                80
 01/07/2021   10:15:48   (   0.22,-128.15) (   0.63,-130.10)  222.28                80