Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/25/2019   22:00:45   (   0.08,-128.04) (   0.19,-127.54)   56.25                80
 06/28/2019   10:00:42   (  -0.09,-127.96) (  -0.04,-128.18)   24.84                80
 06/29/2019   09:44:27   (  -0.08,-127.93) (  -1.03,-123.60)  492.62                80
 06/30/2019   22:03:28   (   0.11,-127.87) (  -0.11,-128.85)  111.48                80
 07/01/2019   21:47:13   (   0.10,-127.83) (   0.88,-124.27)  405.85                80
 07/03/2019   10:06:05   (  -0.13,-127.78) (   0.27,-129.48)  194.53                80
 07/04/2019   09:49:49   (  -0.11,-127.73) (  -0.72,-124.90)  322.06                80
 07/05/2019   22:08:51   (   0.14,-127.66) (  -0.41,-130.16)  283.85                80
 07/06/2019   21:52:35   (   0.13,-127.62) (   0.58,-125.58)  232.97                80
 07/08/2019   10:11:27   (  -0.15,-127.56) (   0.57,-130.79)  367.35                80