Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 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)
 06/20/2019   21:55:22   (   0.06,-128.17) (   0.48,-126.23)  220.00                80
 06/22/2019   10:14:15   (  -0.08,-128.13) (   0.65,-131.45)  377.99                80
 06/23/2019   09:57:59   (  -0.07,-128.10) (  -0.33,-126.87)  140.32                80
 06/24/2019   22:17:00   (   0.09,-128.06) (  -0.82,-132.12)  462.76                80
 06/25/2019   22:00:45   (   0.08,-128.03) (   0.16,-127.54)   55.76                80
 06/28/2019   10:03:23   (  -0.09,-127.96) (  -0.07,-128.19)   24.85                80
 06/29/2019   09:44:27   (  -0.08,-127.93) (  -1.05,-123.61)  492.81                80
 06/30/2019   22:03:29   (   0.11,-127.87) (  -0.08,-128.86)  112.03                80
 07/01/2019   21:47:13   (   0.10,-127.83) (   0.91,-124.28)  405.36                80
 07/03/2019   10:06:05   (  -0.13,-127.78) (   0.25,-129.49)  194.30                80