Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/14/2017   22:34:17   (  -0.31,-135.22) (  -0.80,-137.42)  250.06                80
 09/15/2017   22:18:13   (  -0.32,-135.24) (   0.19,-132.88)  268.78                80
 09/17/2017   10:40:02   (   0.30,-135.31) (   0.96,-138.16)  325.24                80
 09/18/2017   10:18:38   (   0.31,-135.33) (  -0.08,-133.64)  192.82                80
 09/19/2017   22:40:36   (  -0.29,-135.31) (  -1.09,-138.94)  413.24                80
 09/20/2017   22:24:31   (  -0.30,-135.34) (  -0.10,-134.41)  105.45                80
 09/22/2017   10:46:21   (   0.28,-135.41) (   1.25,-139.69)  487.76                80
 09/23/2017   10:24:57   (   0.29,-135.42) (   0.21,-135.16)   30.14                80
 09/25/2017   22:28:10   (  -0.28,-135.41) (  -0.39,-135.94)   60.10                80
 09/26/2017   22:12:05   (  -0.29,-135.42) (   0.61,-131.40)  457.77                80
 09/28/2017   10:33:55   (   0.27,-135.48) (   0.54,-136.68)  136.47                80