Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 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)
 04/19/2018   10:26:59   (   0.09,-135.35) (   0.04,-135.18)   20.54                80
 04/21/2018   22:27:31   (  -0.09,-135.40) (  -0.24,-135.95)   62.51                80
 04/22/2018   22:11:26   (  -0.10,-135.42) (   0.77,-131.41)  455.47                80
 04/24/2018   10:30:35   (   0.10,-135.43) (   0.39,-136.69)  143.87                80
 04/25/2018   10:14:30   (   0.10,-135.44) (  -0.62,-132.16)  373.98                80
 04/26/2018   22:33:48   (  -0.10,-135.47) (  -0.52,-137.47)  227.81                80
 04/27/2018   22:17:43   (  -0.10,-135.48) (   0.49,-132.94)  289.82                80
 04/29/2018   10:36:51   (   0.09,-135.48) (   0.68,-138.21)  310.35                80
 04/30/2018   10:20:47   (   0.10,-135.49) (  -0.33,-133.68)  207.05                80
 05/01/2018   22:40:03   (  -0.09,-135.51) (  -0.86,-138.98)  395.48                80