Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 4 15.  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)
 04/15/2018   04:31:29   (  79.68,  10.33) 04/15/2018   04:32:01  (  79.67,  10.18)    3.20                32
 04/17/2018   19:58:35   ( -79.56, -42.32) 04/17/2018   19:58:16  ( -79.56, -42.28)    0.79                19
 04/17/2018   20:47:55   (  79.78, 126.98) 04/17/2018   20:48:53  (  79.79, 127.05)    1.56                58
 04/20/2018   11:25:41   (  79.40, -95.19) 04/20/2018   11:24:31  (  79.40, -95.16)    0.92                70
 04/20/2018   12:15:02   ( -79.62,  74.02) 04/20/2018   12:15:10  ( -79.62,  74.00)    0.42                 8
 04/23/2018   03:42:07   (  79.49,  21.36) 04/23/2018   03:41:24  (  79.49,  21.37)    0.26                43
 04/23/2018   04:31:29   ( -79.68,-169.66) 04/23/2018   04:32:04  ( -79.68,-169.71)    1.04                35
 04/25/2018   19:58:33   (  79.55, 137.62) 04/25/2018   19:58:17  (  79.55, 137.62)    0.32                16
 04/25/2018   20:47:54   ( -79.77, -53.10) 04/25/2018   20:48:56  ( -79.77, -53.15)    1.09                62
 04/28/2018   11:25:39   ( -79.41,  84.93) 04/28/2018   11:24:33  ( -79.41,  84.92)    0.25                66