Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2020 1 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 01/11/2020   22:12:23   (   0.05,-128.40) (  -0.55,-131.06)  302.65                80
 01/12/2020   21:56:08   (   0.04,-128.41) (   0.48,-126.48)  219.42                80
 01/14/2020   10:14:59   (  -0.05,-128.43) (   0.65,-131.69)  370.74                80
 01/15/2020   09:58:42   (  -0.05,-128.43) (  -0.32,-127.10)  151.26                80
 01/16/2020   22:17:43   (   0.05,-128.42) (  -0.81,-132.34)  447.17                80
 01/17/2020   22:01:27   (   0.05,-128.42) (   0.22,-127.77)   74.56                80
 01/20/2020   10:04:02   (  -0.04,-128.43) (  -0.06,-128.39)    5.31                80
 01/22/2020   22:04:06   (   0.03,-128.41) (  -0.10,-129.04)   72.63                80
 01/23/2020   21:47:50   (   0.03,-128.40) (   0.93,-124.47)  448.42                80