Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 7 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/23/2018   10:43:10   (  -0.24,-135.50) (   0.70,-139.70)  478.23                80
 07/24/2018   10:27:05   (  -0.23,-135.50) (  -0.28,-135.16)   37.96                80
 07/26/2018   22:27:40   (   0.24,-135.51) (   0.16,-135.95)   50.09                80
 07/27/2018   22:11:35   (   0.23,-135.50) (   1.14,-131.42)  465.81                80
 07/29/2018   10:30:45   (  -0.26,-135.47) (  -0.00,-136.70)  138.98                80
 07/30/2018   10:14:40   (  -0.25,-135.46) (  -0.98,-132.16)  376.49                80
 07/31/2018   22:33:59   (   0.27,-135.47) (  -0.16,-137.48)  228.55                80
 08/01/2018   22:17:54   (   0.26,-135.46) (   0.82,-132.94)  286.77                80
 08/03/2018   10:37:03   (  -0.29,-135.42) (   0.32,-138.22)  318.70                80
 08/04/2018   10:20:59   (  -0.28,-135.40) (  -0.66,-133.68)  195.96                80