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)
 04/23/2018   03:42:08   (  79.41,  20.72) 04/23/2018   03:41:26  (  79.41,  20.70)    0.34                42
 04/23/2018   04:31:29   ( -79.63,-170.08) 04/23/2018   04:32:05  ( -79.63,-170.16)    1.58                36
 04/25/2018   19:58:32   (  79.56, 137.65) 04/25/2018   19:58:17  (  79.57, 137.75)    2.12                15
 04/25/2018   20:47:54   ( -79.75, -53.37) 04/25/2018   20:48:57  ( -79.75, -53.34)    0.78                63
 04/28/2018   11:25:41   ( -79.29,  84.07) 04/28/2018   11:24:37  ( -79.28,  83.94)    2.94                64
 04/28/2018   12:15:00   (  79.56,-106.48) 04/28/2018   12:15:13  (  79.56,-106.58)    2.06                13
 05/01/2018   03:42:05   ( -79.41,-159.29) 05/01/2018   03:41:28  ( -79.41,-159.33)    0.99                37
 05/01/2018   04:31:24   (  79.67,  10.19) 05/01/2018   04:32:04  (  79.67,  10.20)    0.13                40
 05/03/2018   19:58:30   ( -79.52, -42.64) 05/03/2018   19:58:20  ( -79.53, -42.60)    0.84                10