Simultaneous Nadir Overpasses (SNOs) between NOAA-19 and NPP over region 
TLE Epoch: 2013 8 31.  Predictions up to the next  30.0 days:

Date(NOAA-19)     Time(NOAA-19)   NOAA-19 Lat/Lon   Date(NPP)     Time(NPP)    NPP Lat/Lon    Distance (km)   Time Diff(sec)
 09/09/2013   16:18:56   (  22.64, 144.22) 09/09/2013   16:21:22    (  23.64, 139.86)  459.33            146
 09/10/2013   03:35:24   (  22.67, 147.64) 09/10/2013   03:34:08    (  21.98, 144.28)  354.36             76
 09/22/2013   03:02:22   (  11.30, 157.93) 09/22/2013   03:05:37    (  10.27, 153.40)  508.36            195
 09/22/2013   15:39:00   (  19.57, 153.74) 09/22/2013   15:38:07    (  20.30, 150.11)  387.57             53
 09/23/2013   02:54:37   (  22.66, 157.92) 09/23/2013   02:51:00    (  25.79, 154.40)  499.31            217