Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 14.  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   22:28:04   (   0.02,-135.38) (  -0.10,-136.08)   79.24                80
 12/15/2017   22:11:59   (   0.01,-135.37) (   0.89,-131.54)  437.34                80
 12/17/2017   10:31:06   (  -0.03,-135.44) (   0.28,-136.81)  155.92                80
 12/18/2017   10:15:01   (  -0.02,-135.44) (  -0.70,-132.27)  360.24                80
 12/19/2017   22:34:16   (   0.03,-135.35) (  -0.50,-137.57)  253.70                80
 12/20/2017   22:18:12   (   0.02,-135.34) (   0.55,-133.05)  262.03                80
 12/22/2017   10:37:19   (  -0.03,-135.40) (   0.62,-138.32)  332.55                80
 12/23/2017   10:21:13   (  -0.03,-135.39) (  -0.37,-133.78)  182.90                80
 12/24/2017   22:40:29   (   0.04,-135.30) (  -0.82,-139.08)  431.77                80
 12/25/2017   22:24:23   (   0.04,-135.28) (   0.17,-134.54)   83.27                80
 12/28/2017   10:27:26   (  -0.04,-135.31) (  -0.05,-135.29)    2.16                80