Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 23.  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) (   0.21,-136.65)  139.42                80
 06/25/2017   10:14:27   (  -0.06,-135.43) (  -0.82,-132.12)  377.71                80
 06/26/2017   22:33:43   (   0.08,-135.48) (  -0.37,-137.42)  222.29                80
 06/27/2017   22:17:39   (   0.07,-135.48) (   0.66,-132.90)  294.90                80
 06/29/2017   10:36:46   (  -0.09,-135.44) (   0.51,-138.16)  309.74                80
 06/30/2017   10:20:41   (  -0.08,-135.44) (  -0.46,-133.62)  207.15                80
 07/01/2017   22:39:58   (   0.11,-135.48) (  -0.67,-138.94)  393.69                80
 07/02/2017   22:23:52   (   0.10,-135.48) (   0.31,-134.40)  123.10                80
 07/04/2017   10:43:01   (  -0.12,-135.44) (   0.80,-139.68)  482.10                80
 07/05/2017   10:26:55   (  -0.11,-135.44) (  -0.17,-135.13)   34.08                80