Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/25/2018   10:14:30   (   0.10,-135.44) (  -0.63,-132.16)  374.07                80
 04/26/2018   22:33:47   (  -0.10,-135.47) (  -0.57,-137.46)  227.67                80
 04/27/2018   22:17:42   (  -0.10,-135.48) (   0.44,-132.93)  289.99                80
 04/29/2018   10:36:50   (   0.09,-135.48) (   0.73,-138.20)  310.24                80
 04/30/2018   10:20:46   (   0.09,-135.49) (  -0.29,-133.67)  207.13                80
 05/01/2018   22:40:03   (  -0.09,-135.51) (  -0.85,-138.98)  395.47                80
 05/02/2018   22:23:59   (  -0.09,-135.51) (   0.17,-134.45)  121.51                80
 05/04/2018   10:43:07   (   0.08,-135.51) (   1.00,-139.72)  479.93                80
 05/05/2018   10:27:03   (   0.09,-135.51) (  -0.01,-135.19)   36.82                80
 05/07/2018   22:27:34   (  -0.09,-135.52) (  -0.16,-135.96)   50.54                80
 05/08/2018   22:11:29   (  -0.09,-135.51) (   0.80,-131.42)  465.79                80