Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/22/2019   10:14:14   (  -0.08,-128.13) (   0.69,-131.44)  378.12                80
 06/23/2019   09:57:59   (  -0.07,-128.10) (  -0.35,-126.87)  140.16                80
 06/24/2019   22:17:01   (   0.09,-128.06) (  -0.80,-132.12)  462.81                80
 06/25/2019   22:00:45   (   0.08,-128.03) (   0.18,-127.54)   55.61                80
 06/28/2019   10:00:42   (  -0.09,-127.96) (  -0.03,-128.18)   25.03                80
 06/29/2019   09:44:28   (  -0.08,-127.93) (  -1.07,-123.61)  492.45                80
 06/30/2019   22:03:28   (   0.11,-127.87) (  -0.13,-128.85)  112.29                80
 07/01/2019   21:47:13   (   0.10,-127.83) (   0.91,-124.28)  405.04                80
 07/03/2019   10:06:06   (  -0.13,-127.78) (   0.24,-129.49)  194.84                80
 07/04/2019   09:49:50   (  -0.11,-127.74) (  -0.74,-124.91)  321.70                80