Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2017   22:28:03   (   0.02,-135.38) (  -0.16,-136.07)   79.17                80
 12/15/2017   22:11:59   (   0.01,-135.38) (   0.89,-131.54)  437.46                80
 12/17/2017   10:31:06   (  -0.03,-135.45) (   0.28,-136.81)  155.70                80
 12/18/2017   10:15:01   (  -0.02,-135.44) (  -0.71,-132.27)  360.51                80
 12/19/2017   22:34:16   (   0.03,-135.35) (  -0.49,-137.57)  253.37                80
 12/20/2017   22:18:12   (   0.02,-135.35) (   0.56,-133.05)  262.42                80
 12/22/2017   10:37:19   (  -0.03,-135.40) (   0.61,-138.32)  332.06                80
 12/23/2017   10:21:13   (  -0.03,-135.39) (  -0.38,-133.78)  183.43                80
 12/24/2017   22:40:29   (   0.04,-135.30) (  -0.81,-139.08)  431.18                80
 12/25/2017   22:24:23   (   0.03,-135.29) (   0.18,-134.55)   83.88                80