Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 9 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/17/2017   10:40:02   (   0.30,-135.31) (   0.93,-138.16)  325.42                80
 09/18/2017   10:18:38   (   0.31,-135.32) (  -0.05,-133.63)  192.58                80
 09/19/2017   22:40:35   (  -0.29,-135.31) (  -1.12,-138.94)  413.46                80
 09/20/2017   22:24:32   (  -0.30,-135.33) (  -0.08,-134.41)  105.14                80
 09/22/2017   10:46:21   (   0.28,-135.40) (   1.23,-139.69)  488.33                80
 09/23/2017   10:24:57   (   0.29,-135.41) (   0.24,-135.16)   29.35                80
 09/25/2017   22:28:09   (  -0.28,-135.40) (  -0.43,-135.93)   60.86                80
 09/26/2017   22:12:06   (  -0.29,-135.41) (   0.62,-131.41)  456.97                80
 09/28/2017   10:33:55   (   0.27,-135.48) (   0.54,-136.68)  137.55                80
 09/29/2017   10:12:31   (   0.28,-135.48) (  -0.45,-132.15)  379.20                80