Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/21/2018   10:27:03   (   0.06,-135.26) (   0.05,-135.17)   10.75                80
 05/23/2018   22:27:34   (  -0.06,-135.23) (  -0.21,-135.94)   81.01                80
 05/24/2018   22:11:30   (  -0.07,-135.20) (   0.81,-131.41)  433.01                80
 05/26/2018   10:30:37   (   0.05,-135.14) (   0.41,-136.67)  175.01                80
 05/27/2018   10:14:33   (   0.05,-135.11) (  -0.62,-132.14)  338.66                80
 05/28/2018   22:33:49   (  -0.03,-135.09) (  -0.56,-137.45)  268.21                80
 05/29/2018   22:17:45   (  -0.04,-135.06) (   0.46,-132.92)  245.18                80
 05/31/2018   10:36:52   (   0.02,-134.99) (   0.75,-138.18)  363.81                80
 06/01/2018   10:20:47   (   0.03,-134.95) (  -0.27,-133.65)  149.18                80
 06/02/2018   22:40:04   (  -0.01,-134.92) (  -0.90,-138.95)  458.91                80