Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 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)
 09/15/2018   10:33:44   (   0.37,-135.40) (   0.62,-136.62)  138.43                80
 09/16/2018   10:12:19   (   0.37,-135.42) (  -0.38,-132.08)  380.39                80
 09/17/2018   22:34:17   (  -0.36,-135.43) (  -0.78,-137.39)  223.04                80
 09/18/2018   22:18:12   (  -0.36,-135.46) (   0.21,-132.86)  296.07                80
 09/20/2018   10:40:02   (   0.35,-135.52) (   0.93,-138.13)  298.04                80
 09/21/2018   10:18:37   (   0.35,-135.54) (  -0.06,-133.60)  220.19                80
 09/22/2018   22:40:34   (  -0.33,-135.53) (  -1.09,-138.91)  385.31                80
 09/23/2018   22:24:30   (  -0.34,-135.55) (  -0.10,-134.38)  133.33                80
 09/25/2018   10:46:19   (   0.32,-135.62) (   1.24,-139.65)  460.59                80
 09/26/2018   10:24:55   (   0.33,-135.63) (   0.24,-135.12)   57.21                80