Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 12 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/23/2015   10:26:48   (  -0.07,-134.96) (  -0.00,-135.26)   33.96                80
 12/24/2015   10:10:42   (  -0.06,-134.92) (  -1.00,-130.72)  478.28                80
 12/25/2015   22:29:57   (   0.07,-134.83) (  -0.22,-136.02)  135.92                80
 12/26/2015   22:13:51   (   0.06,-134.79) (   0.78,-131.48)  376.44                80
 12/28/2015   10:32:58   (  -0.07,-134.75) (   0.38,-136.76)  228.59                80
 12/29/2015   10:16:53   (  -0.07,-134.71) (  -0.63,-132.22)  283.22                80
 12/30/2015   22:36:07   (   0.08,-134.61) (  -0.59,-137.52)  332.18                80
 12/31/2015   22:20:02   (   0.07,-134.56) (   0.41,-132.98)  179.75                80
 01/02/2016   10:39:09   (  -0.09,-134.53) (   0.74,-138.26)  425.20                80
 01/03/2016   10:23:04   (  -0.08,-134.48) (  -0.27,-133.73)   86.14                80
 01/05/2016   22:23:32   (   0.08,-134.31) (   0.06,-134.49)   19.68                80