Simultaneous Nadir Overpasses (SNOs) between NOAA-19 and NPP over region 
TLE Epoch: 2012 12 20.  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)
 12/22/2012   03:37:43   (  11.56, 147.43) 12/22/2012   03:40:54    (  10.74, 143.90)  396.81            191
 12/22/2012   16:14:37   (  18.81, 143.07) 12/22/2012   16:13:31    (  19.35, 140.48)  278.80             66
 12/23/2012   03:30:01   (  22.67, 147.46) 12/23/2012   03:26:24    (  26.72, 144.77)  526.48            217
 01/03/2013   15:45:02   (  22.63, 151.19) 01/03/2013   15:46:59    (  23.40, 147.83)  354.29            117
 01/04/2013   03:01:33   (  22.67, 154.62) 01/04/2013   02:59:43    (  22.21, 152.28)  246.36            110
 01/16/2013   02:31:38   (  18.00, 162.98) 01/16/2013   02:32:58    (  17.29, 159.83)  343.53             80
 01/16/2013   15:08:21   (  12.67, 158.70) 01/16/2013   15:05:30    (  13.16, 156.47)  248.34            171