Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2013 4 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/17/2013   22:39:36   (  -0.04,-135.01) (  -0.96,-139.13)  468.58                80
 04/18/2013   22:23:32   (  -0.05,-135.05) (   0.08,-134.60)   51.41                80
 04/21/2013   10:26:37   (   0.05,-135.12) (   0.08,-135.34)   24.54                80
 04/22/2013   10:05:13   (   0.05,-135.15) (  -0.91,-130.81)  494.76                80
 04/23/2013   22:27:10   (  -0.04,-135.19) (  -0.27,-136.11)  105.98                80
 04/24/2013   22:11:07   (  -0.05,-135.21) (   0.78,-131.59)  412.93                80
 04/26/2013   10:32:55   (   0.04,-135.24) (   0.43,-136.85)  184.02                80
 04/27/2013   10:11:31   (   0.04,-135.26) (  -0.62,-132.33)  334.18                80
 04/28/2013   22:33:29   (  -0.03,-135.28) (  -0.55,-137.64)  268.61                80
 04/29/2013   22:17:24   (  -0.04,-135.29) (   0.44,-133.10)  249.35                80