Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2015 4 18.  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)
 04/20/2015   08:57:58   (  78.59, -62.93) 04/20/2015   08:57:54  (  78.58, -63.01)    1.70                 4
 04/20/2015   09:47:16   ( -78.98, 106.91) 04/20/2015   09:48:29  ( -78.97, 106.78)    2.86                73
 04/23/2015   00:25:16   ( -78.20,-116.66) 04/23/2015   00:24:10  ( -78.20,-116.74)    2.06                66
 04/23/2015   01:14:27   (  78.82,  54.19) 04/23/2015   01:14:38  (  78.82,  54.27)    1.80                11
 04/25/2015   16:41:46   ( -78.40,   0.15) 04/25/2015   16:40:54  ( -78.40,   0.18)    0.84                52
 04/25/2015   17:31:02   (  78.80, 169.92) 04/25/2015   17:31:28  (  78.79, 169.86)    1.38                26
 04/28/2015   08:58:23   ( -78.38, 115.89) 04/28/2015   08:57:45  ( -78.37, 115.77)    2.81                38
 04/28/2015   09:47:35   (  78.94, -73.42) 04/28/2015   09:48:14  (  78.94, -73.37)    1.30                39
 05/01/2015   01:14:56   ( -78.56,-127.31) 05/01/2015   01:14:30  ( -78.56,-127.34)    0.64                26