Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 8 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/09/2017   22:11:29   (  -0.33,-134.87) (   0.48,-131.29)  409.05                80
 08/11/2017   10:33:17   (   0.35,-134.89) (   0.75,-136.55)  189.58                80
 08/12/2017   10:11:54   (   0.34,-134.91) (  -0.28,-132.02)  327.93                80
 08/13/2017   22:33:51   (  -0.36,-134.95) (  -0.92,-137.33)  272.32                80
 08/14/2017   22:17:48   (  -0.35,-134.96) (   0.11,-132.80)  245.68                80
 08/16/2017   10:39:37   (   0.36,-134.98) (   1.05,-138.08)  353.20                80
 08/17/2017   10:18:13   (   0.35,-134.99) (   0.02,-133.56)  163.27                80
 08/18/2017   22:40:11   (  -0.36,-135.00) (  -1.22,-138.86)  440.09                80
 08/19/2017   22:24:07   (  -0.35,-135.01) (  -0.18,-134.34)   77.10                80
 08/22/2017   10:27:12   (   0.35,-135.04) (   0.38,-135.08)    5.43                80