Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 5 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/11/2019   22:08:23   (  -0.05,-128.31) (  -0.68,-131.10)  318.09                80
 05/12/2019   21:52:18   (  -0.06,-128.33) (   0.32,-126.57)  200.10                80
 05/14/2019   10:11:27   (   0.05,-128.35) (   0.82,-131.85)  398.35                80
 05/15/2019   09:55:23   (   0.06,-128.37) (  -0.17,-127.31)  119.48                80
 05/16/2019   22:14:40   (  -0.04,-128.38) (  -1.01,-132.62)  483.59                80
 05/17/2019   21:58:37   (  -0.05,-128.40) (   0.04,-128.10)   34.27                80
 05/20/2019   09:59:02   (   0.04,-128.43) (   0.10,-128.85)   47.53                80
 05/21/2019   09:42:57   (   0.04,-128.43) (  -0.89,-124.32)  469.77                80
 05/22/2019   22:02:14   (  -0.03,-128.44) (  -0.28,-129.63)  134.42                80
 05/23/2019   21:46:10   (  -0.04,-128.45) (   0.72,-125.09)  382.85                80
 05/25/2019   10:05:19   (   0.03,-128.46) (   0.42,-130.37)  216.73                80