Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/19/2018   22:23:57   (   0.04,-134.79) (   0.12,-134.39)   45.34                80
 06/22/2018   10:24:21   (  -0.05,-134.89) (  -0.02,-135.14)   27.99                80
 06/23/2018   10:08:16   (  -0.04,-134.93) (  -1.00,-130.60)  493.47                80
 06/24/2018   22:27:33   (   0.07,-135.01) (  -0.12,-135.92)  103.74                80
 06/25/2018   22:11:29   (   0.06,-135.04) (   0.91,-131.39)  417.24                80
 06/27/2018   10:30:36   (  -0.09,-135.09) (   0.27,-136.65)  178.69                80
 06/28/2018   10:14:31   (  -0.08,-135.12) (  -0.76,-132.13)  341.95                80
 06/29/2018   22:33:48   (   0.11,-135.19) (  -0.42,-137.43)  256.31                80
 06/30/2018   22:17:43   (   0.09,-135.22) (   0.62,-132.90)  264.07                80
 07/02/2018   10:36:51   (  -0.12,-135.25) (   0.56,-138.17)  332.76                80
 07/03/2018   10:20:46   (  -0.11,-135.28) (  -0.48,-133.64)  187.37                80