Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/26/2017   22:33:43   (   0.08,-135.48) (  -0.36,-137.43)  222.51                80
 06/27/2017   22:17:39   (   0.07,-135.48) (   0.67,-132.90)  294.61                80
 06/29/2017   10:36:46   (  -0.09,-135.44) (   0.50,-138.16)  310.00                80
 06/30/2017   10:20:41   (  -0.08,-135.44) (  -0.47,-133.62)  206.82                80
 07/01/2017   22:39:58   (   0.11,-135.48) (  -0.66,-138.94)  394.23                80
 07/02/2017   22:23:53   (   0.10,-135.48) (   0.32,-134.40)  122.49                80
 07/04/2017   10:43:00   (  -0.12,-135.44) (   0.86,-139.66)  482.67                80
 07/05/2017   10:26:55   (  -0.11,-135.43) (  -0.18,-135.14)   33.43                80
 07/07/2017   22:27:27   (   0.13,-135.44) (   0.03,-135.91)   53.18                80
 07/08/2017   22:11:22   (   0.12,-135.43) (   1.00,-131.37)  462.58                80