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   10:43:09   (  -0.24,-135.50) (   0.72,-139.69)  478.22                80
 07/24/2018   10:27:06   (  -0.23,-135.50) (  -0.32,-135.17)   37.93                80
 07/26/2018   22:27:40   (   0.24,-135.51) (   0.14,-135.95)   50.07                80
 07/27/2018   22:11:35   (   0.23,-135.50) (   1.12,-131.41)  465.78                80
 07/29/2018   10:30:44   (  -0.26,-135.47) (   0.02,-136.69)  139.03                80
 07/30/2018   10:14:40   (  -0.25,-135.46) (  -0.96,-132.16)  376.43                80
 07/31/2018   22:33:58   (   0.27,-135.47) (  -0.19,-137.47)  228.64                80
 08/01/2018   22:17:55   (   0.26,-135.46) (   0.85,-132.95)  286.68                80
 08/03/2018   10:37:03   (  -0.29,-135.42) (   0.35,-138.21)  318.81                80
 08/04/2018   10:20:59   (  -0.28,-135.40) (  -0.63,-133.68)  195.85                80