Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/24/2017   10:30:31   (  -0.07,-135.43) (   0.23,-136.65)  139.44                80
 06/25/2017   10:14:27   (  -0.06,-135.43) (  -0.80,-132.12)  377.73                80
 06/26/2017   22:33:44   (   0.08,-135.48) (  -0.33,-137.43)  222.23                80
 06/27/2017   22:17:38   (   0.07,-135.48) (   0.64,-132.89)  294.97                80
 06/29/2017   10:36:46   (  -0.09,-135.44) (   0.53,-138.16)  309.69                80
 06/30/2017   10:20:41   (  -0.08,-135.45) (  -0.50,-133.63)  207.19                80
 07/01/2017   22:39:58   (   0.11,-135.48) (  -0.68,-138.93)  393.59                80
 07/02/2017   22:23:53   (   0.10,-135.48) (   0.35,-134.40)  123.18                80
 07/04/2017   10:43:00   (  -0.12,-135.44) (   0.82,-139.67)  481.98                80
 07/05/2017   10:26:55   (  -0.11,-135.44) (  -0.15,-135.13)   34.31                80