Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 18.  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) (  -0.86,-138.93)  476.34                80
 06/19/2018   22:23:57   (   0.04,-134.80) (   0.11,-134.39)   45.46                80
 06/22/2018   10:24:21   (  -0.05,-134.90) (  -0.01,-135.14)   27.73                80
 06/23/2018   10:08:17   (  -0.04,-134.94) (  -1.04,-130.61)  493.70                80
 06/24/2018   22:27:33   (   0.07,-135.01) (  -0.14,-135.92)  103.37                80
 06/25/2018   22:11:28   (   0.06,-135.05) (   0.90,-131.39)  417.65                80
 06/27/2018   10:30:36   (  -0.09,-135.09) (   0.28,-136.65)  178.26                80
 06/28/2018   10:14:31   (  -0.08,-135.13) (  -0.75,-132.12)  342.46                80
 06/29/2018   22:33:49   (   0.11,-135.19) (  -0.37,-137.44)  255.64                80
 06/30/2018   22:17:43   (   0.09,-135.22) (   0.61,-132.90)  264.81                80
 07/02/2018   10:36:51   (  -0.12,-135.26) (   0.51,-138.18)  332.02                80