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

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/16/2020   22:17:43   (   0.05,-128.43) (  -0.80,-132.35)  446.05                80
 01/17/2020   22:01:27   (   0.05,-128.43) (   0.17,-127.76)   75.82                80
 01/20/2020   10:04:03   (  -0.04,-128.44) (  -0.07,-128.39)    6.08                80
 01/22/2020   22:04:06   (   0.04,-128.42) (  -0.10,-129.04)   70.75                80
 01/23/2020   21:47:51   (   0.03,-128.42) (   0.93,-124.47)  450.39                80
 01/25/2020   10:06:41   (  -0.03,-128.42) (   0.26,-129.66)  142.22                80
 01/26/2020   09:50:26   (  -0.03,-128.41) (  -0.77,-125.09)  378.84                80
 01/27/2020   22:12:06   (   0.04,-128.40) (  -0.37,-130.33)  219.53                80
 01/28/2020   21:50:31   (   0.03,-128.39) (   0.66,-125.75)  301.31                80