Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2017 12 28.  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)
 12/29/2017   11:25:16   (  79.64, -93.36) 12/29/2017   11:24:49  (  79.64, -93.36)    0.11                27
 12/29/2017   12:14:37   ( -79.82,  75.64) 12/29/2017   12:15:28  ( -79.81,  75.52)    2.61                51
 01/01/2018   03:41:45   (  79.67,  22.74) 01/01/2018   03:41:41  (  79.67,  22.63)    2.23                 4
 01/01/2018   04:31:05   ( -79.92,-167.68) 01/01/2018   04:32:18  ( -79.93,-167.61)    1.53                73
 01/03/2018   19:08:52   ( -79.58, -29.66) 01/03/2018   19:07:53  ( -79.58, -29.61)    1.07                59
 01/03/2018   19:58:12   (  79.81, 139.63) 01/03/2018   19:58:30  (  79.81, 139.75)    2.76                18
 01/06/2018   11:25:21   ( -79.64,  86.63) 01/06/2018   11:24:45  ( -79.64,  86.64)    0.23                36
 01/06/2018   12:14:41   (  79.86,-104.07) 01/06/2018   12:15:22  (  79.87,-103.98)    2.02                41
 01/09/2018   03:41:49   ( -79.69,-157.10) 01/09/2018   03:41:36  ( -79.69,-157.12)    0.33                13