Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 4 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)
 04/09/2018   19:58:34   (  79.61, 138.04) 04/09/2018   19:58:12  (  79.61, 138.14)    2.11                22
 04/09/2018   20:47:56   ( -79.79, -52.96) 04/09/2018   20:48:52  ( -79.79, -52.95)    0.27                56
 04/12/2018   11:25:44   ( -79.35,  84.47) 04/12/2018   11:24:32  ( -79.34,  84.37)    2.06                72
 04/12/2018   12:15:03   (  79.61,-106.06) 04/12/2018   12:15:08  (  79.61,-106.10)    0.91                 5
 04/15/2018   03:42:08   ( -79.50,-158.62) 04/15/2018   03:41:22  ( -79.51,-158.53)    1.98                46
 04/15/2018   04:31:27   (  79.76,  10.90) 04/15/2018   04:31:58  (  79.77,  11.05)    3.07                31
 04/17/2018   19:58:35   ( -79.57, -42.24) 04/17/2018   19:58:16  ( -79.57, -42.24)    0.13                19
 04/17/2018   20:47:55   (  79.79, 127.01) 04/17/2018   20:48:53  (  79.79, 127.07)    1.07                58
 04/20/2018   11:25:41   (  79.40, -95.15) 04/20/2018   11:24:31  (  79.40, -95.14)    0.13                70