Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2017 7 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)
 07/22/2017   11:24:45   (  79.34, -95.55) 07/22/2017   11:24:24  (  79.35, -95.42)    2.84                21
 07/22/2017   12:14:08   ( -79.51,  73.22) 07/22/2017   12:15:05  ( -79.51,  73.15)    1.45                57
 07/25/2017   02:51:52   ( -79.16,-148.49) 07/25/2017   02:50:43  ( -79.16,-148.37)    2.60                69
 07/25/2017   03:41:12   (  79.37,  20.55) 07/25/2017   03:41:21  (  79.38,  20.55)    0.25                 9
 07/27/2017   19:08:17   ( -79.23, -32.17) 07/27/2017   19:07:38  ( -79.23, -32.15)    0.39                39
 07/27/2017   19:57:37   (  79.44, 136.88) 07/27/2017   19:58:16  (  79.43, 136.77)    2.35                39
 07/30/2017   11:24:43   ( -79.29,  84.14) 07/30/2017   11:24:34  ( -79.29,  84.08)    1.22                 9
 07/30/2017   12:14:00   (  79.62,-106.01) 07/30/2017   12:15:08  (  79.62,-105.89)    2.37                68
 08/02/2017   02:51:46   (  79.17,  31.63) 08/02/2017   02:50:49  (  79.18,  31.70)    1.50                57