Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 1 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/17/2020   22:01:27   (   0.05,-128.43) (   0.23,-127.77)   75.92                80
 01/20/2020   10:04:02   (  -0.05,-128.43) (  -0.07,-128.39)    5.98                80
 01/22/2020   22:06:46   (   0.04,-128.42) (  -0.09,-129.04)   70.70                80
 01/23/2020   21:47:51   (   0.03,-128.42) (   0.94,-124.47)  450.44                80
 01/25/2020   10:06:41   (  -0.03,-128.41) (   0.24,-129.66)  142.38                80
 01/26/2020   09:50:26   (  -0.03,-128.41) (  -0.79,-125.09)  378.70                80
 01/27/2020   22:12:05   (   0.04,-128.39) (  -0.41,-130.32)  219.46                80
 01/28/2020   21:50:29   (   0.04,-128.39) (   0.63,-125.74)  301.36                80
 01/30/2020   10:12:00   (  -0.04,-128.38) (   0.55,-130.94)  292.04                80