Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/30/2019   22:03:28   (   0.11,-127.88) (  -0.10,-128.85)  109.87                80
 07/01/2019   21:47:13   (   0.10,-127.85) (   0.89,-124.27)  407.71                80
 07/03/2019   10:06:05   (  -0.12,-127.79) (   0.25,-129.48)  192.73                80
 07/04/2019   09:49:49   (  -0.11,-127.75) (  -0.74,-124.91)  324.14                80
 07/05/2019   22:08:51   (   0.14,-127.69) (  -0.39,-130.16)  280.81                80
 07/06/2019   21:52:35   (   0.13,-127.65) (   0.60,-125.58)  236.27                80
 07/08/2019   10:11:28   (  -0.15,-127.59) (   0.55,-130.79)  364.16                80
 07/09/2019   09:55:12   (  -0.14,-127.55) (  -0.44,-126.21)  152.43                80
 07/10/2019   22:14:12   (   0.16,-127.47) (  -0.74,-131.45)  453.56                80
 07/11/2019   21:57:57   (   0.15,-127.43) (   0.25,-126.87)   63.15                80