Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 4 6.  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)
 04/07/2018   03:42:08   (  79.49,  21.29) 04/07/2018   03:41:20  (  79.48,  21.25)    0.84                48
 04/07/2018   04:31:30   ( -79.67,-169.73) 04/07/2018   04:32:00  ( -79.66,-169.88)    3.15                30
 04/09/2018   19:58:34   (  79.60, 138.00) 04/09/2018   19:58:12  (  79.61, 138.11)    2.13                22
 04/09/2018   20:47:56   ( -79.79, -52.98) 04/09/2018   20:48:52  ( -79.79, -52.97)    0.24                56
 04/12/2018   11:25:44   ( -79.34,  84.44) 04/12/2018   11:24:32  ( -79.34,  84.34)    2.19                72
 04/12/2018   12:15:03   (  79.61,-106.10) 04/12/2018   12:15:08  (  79.61,-106.15)    1.01                 5
 04/15/2018   03:42:09   ( -79.49,-158.66) 04/15/2018   03:41:23  ( -79.50,-158.59)    1.65                46
 04/15/2018   04:31:28   (  79.75,  10.84) 04/15/2018   04:31:59  (  79.76,  10.98)    2.75                31
 04/17/2018   19:58:35   ( -79.56, -42.30) 04/17/2018   19:58:16  ( -79.56, -42.32)    0.57                19
 04/17/2018   20:47:55   (  79.78, 126.95) 04/17/2018   20:48:53  (  79.78, 126.97)    0.45                58
 04/20/2018   11:25:41   (  79.39, -95.22) 04/20/2018   11:24:31  (  79.39, -95.26)    0.95                70