Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 5 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)
 05/09/2018   03:42:00   (  79.47,  21.15) 05/09/2018   03:41:26  (  79.48,  21.25)    2.21                34
 05/09/2018   04:31:22   ( -79.65,-169.92) 05/09/2018   04:32:06  ( -79.66,-169.92)    0.23                44
 05/11/2018   19:58:28   (  79.50, 137.21) 05/11/2018   19:58:21  (  79.49, 137.14)    1.34                 7
 05/11/2018   20:47:48   ( -79.76, -53.29) 05/11/2018   20:48:58  ( -79.77, -53.17)    2.63                70
 05/14/2018   11:25:35   ( -79.33,  84.30) 05/14/2018   11:24:37  ( -79.33,  84.29)    0.22                58
 05/14/2018   12:14:53   (  79.63,-105.97) 05/14/2018   12:15:12  (  79.64,-105.87)    2.07                19
 05/17/2018   03:42:02   ( -79.39,-159.43) 05/17/2018   03:41:31  ( -79.37,-159.57)    3.15                31
 05/17/2018   04:31:21   (  79.65,  10.02) 05/17/2018   04:32:07  (  79.65,  10.00)    0.46                46
 05/19/2018   19:58:26   ( -79.52, -42.67) 05/19/2018   19:58:21  ( -79.52, -42.64)    0.78                 5
 05/19/2018   20:47:47   (  79.70, 126.26) 05/19/2018   20:49:00  (  79.69, 126.14)    2.44                73
 05/22/2018   11:25:30   (  79.40, -95.23) 05/22/2018   11:24:34  (  79.41, -95.08)    3.06                56