Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/28/2017   22:33:47   (   0.23,-134.84) (  -0.34,-137.41)  293.77                80
 07/29/2017   22:17:42   (   0.22,-134.80) (   0.63,-132.88)  218.44                80
 07/31/2017   10:36:52   (  -0.25,-134.71) (   0.54,-138.15)  393.01                80
 08/01/2017   10:20:48   (  -0.24,-134.66) (  -0.49,-133.63)  118.47                80
 08/02/2017   22:40:06   (   0.26,-134.62) (  -0.72,-138.93)  491.76                80
 08/03/2017   22:24:02   (   0.26,-134.58) (   0.31,-134.41)   19.67                80
 08/06/2017   10:24:27   (  -0.27,-134.43) (  -0.11,-135.14)   81.57                80
 08/07/2017   10:08:23   (  -0.26,-134.38) (  -1.08,-130.61)  428.98                80
 08/08/2017   22:27:41   (   0.28,-134.32) (  -0.06,-135.92)  182.71                80
 08/09/2017   22:11:36   (   0.28,-134.27) (   0.91,-131.39)  327.92                80