Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2015 12 20.  Predictions up to the next  14.0 days:

     Date     Time(AURA) AURA Lat/Lon Date Time(NPP) NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2015   17:29:48   (  79.02, 171.30) 12/21/2015   17:28:47  (  79.02, 171.27)    0.52                61
 12/21/2015   18:19:06   ( -79.38, -18.79) 12/21/2015   18:19:22  ( -79.38, -18.73)    1.48                16
 12/24/2015   09:46:12   (  79.24, -71.47) 12/24/2015   09:45:34  (  79.24, -71.33)    2.86                38
 12/24/2015   10:35:35   ( -79.40,  97.23) 12/24/2015   10:36:15  ( -79.40,  97.15)    1.74                40
 12/27/2015   02:02:38   (  79.32,  44.95) 12/27/2015   02:02:24  (  79.32,  45.03)    1.84                14
 12/27/2015   02:52:01   ( -79.48,-146.32) 12/27/2015   02:53:05  ( -79.47,-146.46)    3.01                64
 12/29/2015   17:29:49   ( -79.00,  -8.79) 12/29/2015   17:28:42  ( -79.00,  -8.83)    0.87                67
 12/29/2015   18:19:04   (  79.42, 161.53) 12/29/2015   18:19:14  (  79.43, 161.65)    2.71                10
 01/01/2016   09:46:13   ( -79.18, 108.15) 01/01/2016   09:45:30  ( -79.18, 108.22)    1.53                43