Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2019 6 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/12/2019   10:03:28   (  -0.02,-128.34) (   0.06,-128.84)   56.30                80
 06/13/2019   09:47:13   (  -0.01,-128.32) (  -0.92,-124.26)  463.30                80
 06/14/2019   22:06:14   (   0.04,-128.30) (  -0.24,-129.50)  137.74                80
 06/15/2019   21:50:00   (   0.03,-128.28) (   0.80,-124.94)  381.80                80
 06/17/2019   10:08:51   (  -0.05,-128.26) (   0.38,-130.14)  214.71                80
 06/18/2019   09:52:37   (  -0.04,-128.24) (  -0.66,-125.57)  304.29                80
 06/19/2019   22:11:38   (   0.07,-128.20) (  -0.50,-130.82)  298.03                80
 06/20/2019   21:55:22   (   0.06,-128.18) (   0.49,-126.24)  221.14                80
 06/22/2019   10:14:15   (  -0.08,-128.16) (   0.64,-131.45)  375.40                80
 06/23/2019   09:57:59   (  -0.07,-128.13) (  -0.34,-126.87)  143.33                80