Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 10 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)
 10/19/2018   22:34:21   (  -0.22,-135.47) (  -0.65,-137.46)  227.07                80
 10/20/2018   22:18:15   (  -0.23,-135.45) (   0.33,-132.92)  287.54                80
 10/22/2018   10:37:23   (   0.21,-135.47) (   0.80,-138.21)  311.38                80
 10/23/2018   10:21:18   (   0.22,-135.45) (  -0.17,-133.67)  202.43                80
 10/24/2018   22:40:34   (  -0.19,-135.35) (  -1.00,-138.98)  413.85                80
 10/25/2018   22:24:29   (  -0.21,-135.32) (  -0.02,-134.44)   99.98                80
 10/27/2018   10:43:37   (   0.18,-135.34) (   1.15,-139.72)  499.37                80
 10/28/2018   10:27:32   (   0.19,-135.30) (   0.17,-135.19)   13.34                80
 10/30/2018   22:28:02   (  -0.18,-135.14) (  -0.35,-135.96)   93.04                80
 10/31/2018   22:11:57   (  -0.19,-135.10) (   0.62,-131.42)  419.48                80