Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 4 17.  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   11:25:41   (  79.40, -95.16) 04/20/2018   11:24:31  (  79.40, -95.13)    0.71                70
 04/20/2018   12:15:02   ( -79.63,  74.04) 04/20/2018   12:15:10  ( -79.62,  74.02)    0.55                 8
 04/23/2018   03:42:08   (  79.46,  21.13) 04/23/2018   03:41:25  (  79.46,  21.11)    0.34                43
 04/23/2018   04:31:29   ( -79.68,-169.64) 04/23/2018   04:32:04  ( -79.68,-169.71)    1.40                35
 04/25/2018   19:58:33   (  79.55, 137.65) 04/25/2018   19:58:17  (  79.55, 137.62)    0.60                16
 04/25/2018   20:47:54   ( -79.78, -53.09) 04/25/2018   20:48:56  ( -79.77, -53.17)    1.84                62
 04/28/2018   11:25:40   ( -79.38,  84.68) 04/28/2018   11:24:34  ( -79.37,  84.62)    1.29                66
 04/28/2018   12:14:59   (  79.64,-105.85) 04/28/2018   12:15:10  (  79.64,-105.87)    0.53                11
 05/01/2018   03:42:06   ( -79.46,-158.86) 05/01/2018   03:41:27  ( -79.46,-158.91)    0.96                39