Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2017   10:27:33   (  -0.02,-135.45) (  -0.04,-135.30)   16.96                80
 12/14/2017   22:28:04   (   0.02,-135.38) (  -0.12,-136.07)   78.87                80
 12/15/2017   22:11:59   (   0.01,-135.38) (   0.87,-131.54)  437.89                80
 12/17/2017   10:31:06   (  -0.02,-135.45) (   0.30,-136.81)  154.76                80
 12/18/2017   10:15:01   (  -0.02,-135.45) (  -0.75,-132.28)  361.63                80
 12/19/2017   22:34:17   (   0.03,-135.37) (  -0.45,-137.58)  252.29                80
 12/20/2017   22:18:11   (   0.02,-135.36) (   0.54,-133.05)  263.64                80
 12/22/2017   10:37:19   (  -0.03,-135.42) (   0.63,-138.32)  330.26                80
 12/23/2017   10:21:14   (  -0.03,-135.41) (  -0.42,-133.79)  185.41                80