Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/06/2018   10:24:21   (   0.01,-134.71) (   0.12,-135.14)   49.19                80
 06/07/2018   10:08:16   (   0.02,-134.66) (  -0.90,-130.61)  462.63                80
 06/08/2018   22:27:33   (  -0.00,-134.63) (  -0.27,-135.91)  145.98                80
 06/09/2018   22:11:27   (  -0.01,-134.58) (   0.70,-131.37)  365.58                80
 06/11/2018   10:30:35   (  -0.01,-134.46) (   0.44,-136.64)  247.69                80
 06/12/2018   10:14:30   (  -0.01,-134.41) (  -0.53,-132.10)  263.10                80
 06/13/2018   22:33:46   (   0.03,-134.35) (  -0.65,-137.41)  347.69                80
 06/14/2018   22:17:41   (   0.02,-134.30) (   0.32,-132.86)  162.80                80
 06/16/2018   10:36:49   (  -0.05,-134.17) (   0.81,-138.14)  451.53                80
 06/17/2018   10:20:44   (  -0.03,-134.11) (  -0.16,-133.60)   58.48                80