Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/13/2017   22:33:51   (  -0.36,-134.95) (  -0.92,-137.33)  271.41                80
 08/14/2017   22:17:48   (  -0.35,-134.97) (   0.11,-132.80)  246.74                80
 08/16/2017   10:39:37   (   0.36,-134.99) (   1.05,-138.08)  352.62                80
 08/17/2017   10:18:13   (   0.35,-134.99) (   0.02,-133.56)  163.99                80
 08/18/2017   22:40:11   (  -0.36,-135.01) (  -1.22,-138.86)  438.42                80
 08/19/2017   22:24:07   (  -0.35,-135.03) (  -0.18,-134.34)   78.91                80
 08/22/2017   10:27:12   (   0.35,-135.05) (   0.38,-135.07)    4.15                80
 08/24/2017   22:27:46   (  -0.35,-135.06) (  -0.53,-135.86)   90.70                80
 08/25/2017   22:11:43   (  -0.35,-135.07) (   0.51,-131.33)  426.41                80