Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 4 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)
 04/20/2018   11:25:44   (  79.27, -96.07) 04/20/2018   11:24:35  (  79.27, -96.20)    2.81                69
 04/20/2018   12:15:02   ( -79.61,  73.89) 04/20/2018   12:15:10  ( -79.62,  73.99)    2.17                 8
 04/23/2018   03:42:08   (  79.43,  20.85) 04/23/2018   03:41:26  (  79.43,  20.83)    0.58                42
 04/23/2018   04:31:30   ( -79.62,-170.20) 04/23/2018   04:32:06  ( -79.61,-170.30)    1.99                36
 04/25/2018   19:58:32   (  79.55, 137.53) 04/25/2018   19:58:17  (  79.55, 137.60)    1.59                15
 04/25/2018   20:47:54   ( -79.73, -53.49) 04/25/2018   20:48:57  ( -79.73, -53.48)    0.18                63
 04/28/2018   11:25:38   ( -79.40,  84.74) 04/28/2018   11:24:33  ( -79.40,  84.86)    2.61                65
 04/28/2018   12:15:00   (  79.55,-106.59) 04/28/2018   12:15:13  (  79.54,-106.72)    2.81                13
 05/01/2018   03:42:06   ( -79.40,-159.38) 05/01/2018   03:41:29  ( -79.39,-159.47)    2.04                37
 05/01/2018   04:31:25   (  79.66,  10.09) 05/01/2018   04:32:05  (  79.66,  10.05)    0.89                40
 05/03/2018   19:58:31   ( -79.51, -42.72) 05/03/2018   19:58:21  ( -79.51, -42.74)    0.46                10