Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 8 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 08/01/2019   22:00:38   (   0.26,-128.26) (   0.43,-127.59)   76.10                80
 08/04/2019   10:03:16   (  -0.27,-128.32) (  -0.31,-128.24)   10.73                80
 08/06/2019   22:03:21   (   0.28,-128.34) (   0.16,-128.90)   63.92                80
 08/07/2019   21:47:05   (   0.28,-128.36) (   1.15,-124.32)  458.99                80
 08/09/2019   10:05:59   (  -0.30,-128.40) (  -0.04,-129.54)  130.30                80
 08/10/2019   09:49:44   (  -0.29,-128.41) (  -1.09,-124.98)  392.13                80
 08/11/2019   22:08:43   (   0.31,-128.40) (  -0.11,-130.21)  206.65                80
 08/12/2019   21:52:29   (   0.31,-128.41) (   0.95,-125.65)  315.70                80
 08/14/2019   10:11:21   (  -0.33,-128.46) (   0.23,-130.86)  273.99                80