Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 6 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/08/2015   10:41:39   (  -0.02,-134.80) (   0.72,-138.22)  388.71                80
 06/09/2015   10:25:33   (  -0.01,-134.76) (  -0.27,-133.68)  123.06                80
 06/10/2015   22:44:50   (   0.03,-134.67) (  -0.91,-138.99)  491.24                80
 06/11/2015   22:28:44   (   0.02,-134.63) (   0.08,-134.46)   20.30                80
 06/14/2015   10:29:05   (  -0.03,-134.52) (   0.14,-135.18)   76.41                80
 06/15/2015   10:13:00   (  -0.03,-134.47) (  -0.91,-130.66)  434.58                80
 06/16/2015   22:32:16   (   0.04,-134.38) (  -0.32,-135.96)  180.93                80
 06/17/2015   22:16:10   (   0.04,-134.32) (   0.67,-131.43)  329.86                80
 06/19/2015   10:35:18   (  -0.05,-134.25) (   0.47,-136.71)  278.69                80
 06/20/2015   10:19:12   (  -0.04,-134.20) (  -0.52,-132.17)  231.95                80
 06/21/2015   22:38:27   (   0.06,-134.10) (  -0.69,-137.47)  384.15                80