Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 09/18/2019   21:52:02   (  -0.34,-127.99) (   0.25,-125.46)  289.21                80
 09/20/2019   10:13:33   (   0.33,-127.97) (   0.92,-130.66)  306.78                80
 09/21/2019   09:51:58   (   0.34,-127.93) (  -0.09,-126.09)  210.60                80
 09/22/2019   22:13:38   (  -0.32,-127.85) (  -1.10,-131.32)  396.22                80
 09/23/2019   21:57:22   (  -0.32,-127.81) (  -0.10,-126.75)  121.08                80
 09/25/2019   10:16:14   (   0.30,-127.78) (   1.26,-131.95)  475.53                80
 09/26/2019   09:59:59   (   0.31,-127.74) (   0.20,-127.39)   41.27                80
 09/28/2019   22:00:04   (  -0.30,-127.61) (  -0.39,-128.05)   50.17                80
 09/29/2019   21:43:49   (  -0.31,-127.57) (   0.61,-123.47)  466.84                80
 10/01/2019   10:02:40   (   0.29,-127.54) (   0.55,-128.68)  130.01                80