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   19:08:31   (  79.64, 150.77) 12/10/2017   19:08:02  (  79.65, 150.87)    2.20                29
 12/10/2017   19:57:53   ( -79.83, -40.18) 12/10/2017   19:58:42  ( -79.83, -40.18)    0.13                49
 12/13/2017   11:25:00   (  79.69, -92.98) 12/13/2017   11:24:55  (  79.69, -92.96)    0.48                 5
 12/13/2017   12:14:22   ( -79.88,  76.09) 12/13/2017   12:15:35  ( -79.87,  76.01)    1.61                73
 12/16/2017   02:52:09   ( -79.52,-145.99) 12/16/2017   02:51:11  ( -79.52,-146.04)    0.91                58
 12/16/2017   03:41:28   (  79.77,  23.51) 12/16/2017   03:41:47  (  79.77,  23.52)    0.16                19
 12/18/2017   19:08:37   ( -79.60, -29.56) 12/18/2017   19:08:03  ( -79.60, -29.56)    0.26                34
 12/18/2017   19:57:56   (  79.85, 139.97) 12/18/2017   19:58:39  (  79.85, 140.02)    1.13                43
 12/21/2017   11:25:02   ( -79.74,  87.39) 12/21/2017   11:24:52  ( -79.75,  87.50)    2.29                10