Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 9 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)
 09/10/2015   22:21:06   (  -0.35,-135.24) (   0.16,-132.84)  272.48                80
 09/12/2015   10:40:12   (   0.34,-135.23) (   1.00,-138.11)  328.77                80
 09/13/2015   10:21:26   (   0.34,-135.24) (  -0.04,-133.58)  188.74                80
 09/14/2015   22:43:21   (  -0.33,-135.26) (  -1.15,-138.88)  412.91                80
 09/15/2015   22:27:15   (  -0.34,-135.27) (  -0.11,-134.36)  104.64                80
 09/17/2015   10:46:21   (   0.32,-135.26) (   1.32,-139.62)  497.02                80
 09/18/2015   10:30:15   (   0.33,-135.26) (   0.28,-135.09)   19.77                80
 09/20/2015   22:30:44   (  -0.32,-135.26) (  -0.42,-135.86)   67.49                80
 09/21/2015   22:14:37   (  -0.32,-135.26) (   0.56,-131.32)  448.95                80
 09/23/2015   10:33:44   (   0.30,-135.23) (   0.58,-136.59)  154.30                80
 09/24/2015   10:17:37   (   0.31,-135.22) (  -0.41,-132.05)  361.39                80