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   22:00:37   (   0.26,-128.26) (   0.38,-127.58)   76.13                80
 08/04/2019   10:03:16   (  -0.27,-128.33) (  -0.32,-128.24)   11.09                80
 08/06/2019   22:03:21   (   0.28,-128.34) (   0.17,-128.90)   63.84                80
 08/07/2019   21:47:05   (   0.28,-128.36) (   1.16,-124.33)  459.10                80
 08/09/2019   10:05:59   (  -0.30,-128.40) (  -0.05,-129.55)  130.09                80
 08/10/2019   09:49:43   (  -0.29,-128.42) (  -1.04,-124.97)  392.35                80
 08/11/2019   22:08:44   (   0.31,-128.41) (  -0.10,-130.21)  206.46                80
 08/12/2019   21:52:29   (   0.31,-128.42) (   0.95,-125.65)  315.91                80
 08/14/2019   10:11:21   (  -0.33,-128.46) (   0.22,-130.86)  273.69                80
 08/15/2019   09:55:07   (  -0.32,-128.47) (  -0.83,-126.29)  248.43                80