Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2017 12 8.  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)
 12/10/2017   19:08:32   (  79.61, 150.51) 12/10/2017   19:08:03  (  79.61, 150.53)    0.44                29
 12/10/2017   19:57:54   ( -79.79, -40.46) 12/10/2017   19:58:43  ( -79.79, -40.57)    2.30                49
 12/13/2017   11:24:59   (  79.73, -92.69) 12/13/2017   11:24:53  (  79.74, -92.55)    2.80                 6
 12/13/2017   12:14:22   ( -79.88,  76.10) 12/13/2017   12:15:34  ( -79.88,  76.10)    0.25                72
 12/16/2017   02:52:10   ( -79.48,-146.24) 12/16/2017   02:51:11  ( -79.48,-146.34)    2.12                59
 12/16/2017   03:41:29   (  79.74,  23.26) 12/16/2017   03:41:47  (  79.74,  23.22)    0.74                18
 12/18/2017   19:08:37   ( -79.60, -29.53) 12/18/2017   19:08:01  ( -79.61, -29.48)    1.25                36
 12/18/2017   19:57:56   (  79.85, 140.00) 12/18/2017   19:58:37  (  79.86, 140.13)    2.67                41
 12/21/2017   11:25:05   ( -79.64,  86.62) 12/21/2017   11:24:53  ( -79.64,  86.55)    1.29                12