Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/29/2018   10:36:51   (   0.09,-135.47) (   0.69,-138.20)  311.07                80
 04/30/2018   10:20:47   (   0.09,-135.48) (  -0.32,-133.67)  206.06                80
 05/01/2018   22:40:03   (  -0.09,-135.50) (  -0.88,-138.97)  396.23                80
 05/02/2018   22:23:58   (  -0.09,-135.50) (   0.14,-134.44)  120.56                80
 05/04/2018   10:43:07   (   0.08,-135.49) (   1.03,-139.72)  481.74                80
 05/05/2018   10:27:02   (   0.09,-135.49) (   0.02,-135.19)   34.69                80
 05/07/2018   22:27:34   (  -0.09,-135.50) (  -0.19,-135.96)   52.46                80
 05/08/2018   22:11:30   (  -0.09,-135.49) (   0.83,-131.43)  463.61                80
 05/10/2018   10:30:38   (   0.08,-135.47) (   0.35,-136.70)  139.89                80
 05/11/2018   10:14:33   (   0.09,-135.46) (  -0.67,-132.17)  375.83                80