Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 17.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/18/2018   22:40:03   (   0.06,-134.75) (  -0.87,-138.93)  476.30                80
 06/19/2018   22:23:57   (   0.04,-134.80) (   0.10,-134.39)   45.55                80
 06/22/2018   10:24:21   (  -0.05,-134.90) (  -0.01,-135.14)   27.59                80
 06/23/2018   10:08:17   (  -0.04,-134.94) (  -1.04,-130.61)  493.85                80
 06/24/2018   22:27:33   (   0.07,-135.01) (  -0.14,-135.91)  103.15                80
 06/25/2018   22:11:28   (   0.06,-135.05) (   0.89,-131.39)  417.90                80
 06/27/2018   10:30:37   (  -0.09,-135.10) (   0.24,-136.66)  178.00                80
 06/28/2018   10:14:31   (  -0.08,-135.13) (  -0.74,-132.12)  342.76                80
 06/29/2018   22:33:49   (   0.11,-135.20) (  -0.38,-137.44)  255.26                80
 06/30/2018   22:17:43   (   0.09,-135.23) (   0.59,-132.90)  265.21                80