Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 10 19.  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) (  -0.64,-137.47)  227.02                80
 10/20/2018   22:18:15   (  -0.23,-135.45) (   0.34,-132.93)  287.62                80
 10/22/2018   10:37:24   (   0.21,-135.47) (   0.79,-138.21)  311.40                80
 10/23/2018   10:21:18   (   0.22,-135.45) (  -0.18,-133.67)  202.42                80
 10/24/2018   22:40:34   (  -0.19,-135.35) (  -0.98,-138.98)  413.75                80
 10/25/2018   22:24:29   (  -0.21,-135.32) (  -0.01,-134.44)  100.09                80
 10/27/2018   10:43:37   (   0.18,-135.34) (   1.13,-139.73)  499.33                80
 10/28/2018   10:27:32   (   0.19,-135.30) (   0.15,-135.19)   13.47                80
 10/30/2018   22:28:03   (  -0.18,-135.14) (  -0.34,-135.96)   92.89                80
 10/31/2018   22:11:57   (  -0.19,-135.10) (   0.64,-131.42)  419.67                80
 11/02/2018   10:31:04   (   0.16,-135.11) (   0.54,-136.69)  180.99                80