Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 31.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/01/2017   10:20:48   (  -0.24,-134.66) (  -0.47,-133.62)  118.05                80
 08/02/2017   22:40:06   (   0.26,-134.61) (  -0.68,-138.94)  492.65                80
 08/03/2017   22:24:02   (   0.26,-134.56) (   0.29,-134.40)   18.57                80
 08/06/2017   10:24:27   (  -0.27,-134.41) (  -0.09,-135.14)   82.93                80
 08/07/2017   10:08:23   (  -0.26,-134.36) (  -1.12,-130.61)  427.44                80
 08/08/2017   22:27:40   (   0.28,-134.30) (  -0.09,-135.92)  184.79                80
 08/09/2017   22:11:37   (   0.28,-134.24) (   0.94,-131.39)  325.67                80
 08/11/2017   10:30:45   (  -0.29,-134.14) (   0.28,-136.66)  287.09                80
 08/12/2017   10:14:42   (  -0.29,-134.08) (  -0.75,-132.13)  222.59                80
 08/13/2017   22:33:59   (   0.30,-134.00) (  -0.45,-137.44)  391.56                80