Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 6 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/27/2017   22:17:39   (   0.07,-135.48) (   0.66,-132.89)  294.40                80
 06/29/2017   10:36:46   (  -0.09,-135.44) (   0.51,-138.16)  310.19                80
 06/30/2017   10:20:41   (  -0.08,-135.44) (  -0.46,-133.62)  206.53                80
 07/01/2017   22:39:58   (   0.11,-135.47) (  -0.67,-138.94)  394.89                80
 07/02/2017   22:23:52   (   0.10,-135.47) (   0.31,-134.39)  121.74                80
 07/04/2017   10:43:01   (  -0.12,-135.43) (   0.80,-139.68)  483.39                80
 07/05/2017   10:26:55   (  -0.11,-135.42) (  -0.17,-135.13)   32.60                80
 07/07/2017   22:27:27   (   0.13,-135.43) (   0.02,-135.91)   54.48                80
 07/08/2017   22:11:22   (   0.12,-135.42) (   1.00,-131.37)  461.18                80
 07/10/2017   10:30:29   (  -0.14,-135.37) (   0.17,-136.64)  145.20                80
 07/11/2017   10:14:24   (  -0.13,-135.35) (  -0.87,-132.11)  369.96                80