Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 5 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2015   22:22:36   (  -0.03,-135.31) (   0.49,-132.91)  272.81                80
 05/23/2015   10:41:44   (   0.02,-135.32) (   0.64,-138.20)  326.75                80
 05/24/2015   10:25:39   (   0.03,-135.32) (  -0.34,-133.66)  188.89                80
 05/25/2015   22:44:55   (  -0.02,-135.28) (  -0.84,-138.97)  420.33                80
 05/26/2015   22:28:50   (  -0.03,-135.27) (   0.14,-134.43)   95.13                80
 05/29/2015   10:31:53   (   0.02,-135.27) (  -0.00,-135.18)    9.86                80
 05/31/2015   22:32:23   (  -0.01,-135.21) (  -0.19,-135.96)   86.01                80
 06/01/2015   22:16:19   (  -0.01,-135.19) (   0.85,-131.44)  428.41                80
 06/03/2015   10:35:26   (  -0.00,-135.18) (   0.31,-136.71)  173.57                80
 06/04/2015   10:19:21   (   0.00,-135.16) (  -0.68,-132.18)  340.37                80