Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/21/2019   09:51:58   (   0.34,-127.93) (  -0.09,-126.09)  211.02                80
 09/22/2019   22:13:38   (  -0.32,-127.86) (  -1.10,-131.32)  394.91                80
 09/23/2019   21:57:23   (  -0.32,-127.82) (  -0.10,-126.75)  122.59                80
 09/25/2019   10:16:14   (   0.30,-127.79) (   1.26,-131.95)  474.30                80
 09/26/2019   09:59:59   (   0.31,-127.75) (   0.20,-127.39)   42.69                80
 09/28/2019   22:00:04   (  -0.30,-127.63) (  -0.39,-128.05)   47.67                80
 09/29/2019   21:43:49   (  -0.31,-127.59) (   0.61,-123.47)  469.52                80
 10/01/2019   10:02:40   (   0.29,-127.56) (   0.55,-128.67)  127.61                80
 10/02/2019   09:46:25   (   0.30,-127.51) (  -0.46,-124.10)  388.91                80
 10/03/2019   22:05:25   (  -0.28,-127.41) (  -0.73,-129.34)  219.92                80
 10/04/2019   21:49:09   (  -0.29,-127.37) (   0.27,-124.76)  296.67                80