Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/31/2018   10:36:52   (   0.02,-134.96) (   0.72,-138.18)  366.65                80
 06/01/2018   10:20:47   (   0.03,-134.92) (  -0.25,-133.64)  145.84                80
 06/02/2018   22:40:03   (  -0.01,-134.89) (  -0.93,-138.94)  461.98                80
 06/03/2018   22:23:59   (  -0.02,-134.85) (   0.10,-134.41)   50.46                80
 06/06/2018   10:24:21   (   0.01,-134.71) (   0.09,-135.14)   48.91                80
 06/07/2018   10:08:16   (   0.03,-134.66) (  -0.88,-130.60)  462.98                80
 06/08/2018   22:27:32   (  -0.00,-134.62) (  -0.29,-135.91)  146.21                80
 06/09/2018   22:11:28   (  -0.01,-134.58) (   0.73,-131.38)  365.37                80
 06/11/2018   10:30:35   (  -0.01,-134.47) (   0.47,-136.64)  247.25                80
 06/12/2018   10:14:30   (  -0.00,-134.41) (  -0.50,-132.10)  263.55                80