Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 7 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 07/26/2017   10:30:32   (  -0.22,-134.90) (   0.19,-136.63)  197.59                80
 07/27/2017   10:14:29   (  -0.21,-134.86) (  -0.83,-132.10)  314.72                80
 07/28/2017   22:33:47   (   0.23,-134.84) (  -0.33,-137.42)  293.26                80
 07/29/2017   22:17:43   (   0.22,-134.81) (   0.64,-132.88)  219.10                80
 07/31/2017   10:36:52   (  -0.25,-134.71) (   0.52,-138.16)  392.32                80
 08/01/2017   10:20:49   (  -0.24,-134.67) (  -0.50,-133.63)  119.34                80
 08/02/2017   22:40:06   (   0.26,-134.63) (  -0.71,-138.93)  490.40                80
 08/03/2017   22:24:02   (   0.26,-134.59) (   0.32,-134.41)   21.25                80
 08/06/2017   10:24:27   (  -0.27,-134.44) (  -0.12,-135.15)   79.92                80
 08/07/2017   10:08:23   (  -0.26,-134.39) (  -1.09,-130.61)  430.80                80