Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/24/2018   22:27:33   (   0.07,-135.00) (  -0.15,-135.91)  104.40                80
 06/25/2018   22:11:28   (   0.06,-135.04) (   0.88,-131.38)  416.37                80
 06/27/2018   10:30:36   (  -0.09,-135.08) (   0.24,-136.66)  180.02                80
 06/28/2018   10:14:31   (  -0.08,-135.11) (  -0.74,-132.12)  340.40                80
 06/29/2018   22:33:48   (   0.11,-135.17) (  -0.39,-137.44)  258.14                80
 06/30/2018   22:17:43   (   0.09,-135.20) (   0.59,-132.89)  262.04                80
 07/02/2018   10:36:51   (  -0.12,-135.23) (   0.53,-138.17)  335.16                80
 07/03/2018   10:20:46   (  -0.11,-135.26) (  -0.45,-133.63)  184.72                80
 07/04/2018   22:40:03   (   0.13,-135.31) (  -0.67,-138.95)  414.76                80
 07/05/2018   22:23:57   (   0.12,-135.33) (   0.31,-134.41)  104.83                80
 07/07/2018   10:43:06   (  -0.15,-135.36) (   0.81,-139.69)  493.38                80