Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/10/2015   22:14:03   (   0.03,-135.32) (   0.90,-131.50)  435.14                80
 12/12/2015   10:33:10   (  -0.04,-135.31) (   0.28,-136.78)  167.09                80
 12/13/2015   10:17:05   (  -0.03,-135.28) (  -0.72,-132.24)  346.85                80
 12/14/2015   22:36:20   (   0.05,-135.22) (  -0.46,-137.55)  265.28                80
 12/15/2015   22:20:15   (   0.04,-135.19) (   0.53,-133.01)  248.59                80
 12/17/2015   10:39:22   (  -0.06,-135.18) (   0.64,-138.29)  354.16                80
 12/18/2015   10:23:17   (  -0.05,-135.15) (  -0.36,-133.75)  159.03                80
 12/19/2015   22:42:32   (   0.07,-135.07) (  -0.81,-139.06)  454.77                80
 12/20/2015   22:26:27   (   0.06,-135.03) (   0.19,-134.52)   58.43                80
 12/23/2015   10:26:48   (  -0.06,-134.98) (  -0.02,-135.26)   32.22                80