Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 5 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/22/2019   10:03:29   (   0.03,-128.43) (  -0.03,-128.16)   30.99                80
 05/24/2019   22:03:36   (  -0.03,-128.44) (  -0.10,-128.84)   44.44                80
 05/25/2019   21:47:20   (  -0.04,-128.45) (   0.88,-124.26)  477.15                80
 05/27/2019   10:06:13   (   0.03,-128.45) (   0.26,-129.47)  116.91                80
 05/28/2019   09:49:58   (   0.03,-128.44) (  -0.78,-124.90)  404.17                80
 05/29/2019   22:08:59   (  -0.02,-128.45) (  -0.39,-130.15)  193.91                80
 05/30/2019   21:52:45   (  -0.02,-128.45) (   0.65,-125.58)  327.15                80
 06/01/2019   10:11:36   (   0.00,-128.44) (   0.55,-130.78)  267.42                80
 06/02/2019   09:55:22   (   0.01,-128.43) (  -0.49,-126.22)  252.86                80
 06/03/2019   22:14:23   (   0.01,-128.42) (  -0.68,-131.46)  347.25                80
 06/04/2019   21:58:09   (   0.00,-128.41) (   0.36,-126.90)  172.83                80