Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/26/2019   09:59:59   (   0.31,-127.76) (   0.19,-127.38)   43.78                80
 09/28/2019   22:00:04   (  -0.30,-127.64) (  -0.39,-128.04)   45.48                80
 09/29/2019   21:43:49   (  -0.31,-127.61) (   0.61,-123.47)  471.98                80
 10/01/2019   10:02:40   (   0.29,-127.58) (   0.54,-128.67)  125.11                80
 10/02/2019   09:46:25   (   0.30,-127.53) (  -0.46,-124.10)  391.70                80
 10/03/2019   22:05:25   (  -0.28,-127.44) (  -0.73,-129.33)  216.31                80
 10/04/2019   21:49:10   (  -0.29,-127.40) (   0.33,-124.77)  300.57                80
 10/06/2019   10:08:02   (   0.27,-127.36) (   0.83,-129.97)  296.84                80
 10/07/2019   09:51:46   (   0.27,-127.32) (  -0.18,-125.40)  219.46                80
 10/08/2019   22:10:47   (  -0.25,-127.21) (  -1.01,-130.63)  389.93                80
 10/09/2019   21:54:31   (  -0.26,-127.17) (  -0.01,-126.06)  126.61                80