Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 7 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 07/21/2019   22:06:06   (   0.21,-127.98) (  -0.14,-129.52)  175.92                80
 07/22/2019   21:49:51   (   0.20,-128.01) (   0.91,-124.96)  348.66                80
 07/24/2019   10:08:43   (  -0.22,-128.09) (   0.27,-130.17)  237.87                80
 07/25/2019   09:52:29   (  -0.21,-128.11) (  -0.78,-125.60)  286.11                80
 07/26/2019   22:11:29   (   0.24,-128.12) (  -0.37,-130.84)  311.17                80
 07/27/2019   21:55:15   (   0.23,-128.14) (   0.68,-126.28)  212.51                80
 07/29/2019   10:14:07   (  -0.26,-128.20) (   0.50,-131.49)  375.14                80
 07/30/2019   09:57:53   (  -0.25,-128.22) (  -0.55,-126.92)  147.80                80
 07/31/2019   22:16:53   (   0.27,-128.20) (  -0.60,-132.17)  451.26                80
 08/01/2019   22:00:38   (   0.27,-128.22) (   0.39,-127.59)   71.61                80