Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2015 4 28.  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)
 04/28/2015   08:58:11   ( -78.49, 116.37) 04/28/2015   08:57:41  ( -78.49, 116.50)    2.91                30
 04/28/2015   09:47:29   (  78.81, -74.24) 04/28/2015   09:48:17  (  78.81, -74.23)    0.32                48
 05/01/2015   01:14:41   ( -78.56,-127.40) 05/01/2015   01:14:29  ( -78.57,-127.28)    2.82                12
 05/01/2015   02:03:58   (  78.92,  42.23) 05/01/2015   02:05:04  (  78.92,  42.25)    0.47                66
 05/03/2015   16:41:55   (  78.11, 178.61) 05/03/2015   16:40:45  (  78.11, 178.63)    0.64                70
 05/03/2015   17:31:12   ( -78.56, -11.51) 05/03/2015   17:31:19  ( -78.56, -11.54)    0.51                 7
 05/06/2015   08:58:22   (  78.26, -64.81) 05/06/2015   08:57:31  (  78.26, -64.79)    0.30                51
 05/06/2015   09:47:40   ( -78.67, 104.91) 05/06/2015   09:48:06  ( -78.66, 104.87)    0.75                26
 05/09/2015   01:14:46   (  78.47,  52.11) 05/09/2015   01:14:14  (  78.48,  52.23)    2.94                32
 05/09/2015   02:04:04   ( -78.87,-138.10) 05/09/2015   02:04:49  ( -78.87,-138.01)    2.07                45
 05/11/2015   17:31:13   (  78.57, 168.49) 05/11/2015   17:31:01  (  78.58, 168.59)    2.38                12