Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2021 9 14.  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)
 09/14/2021   02:52:06   (  79.26,  32.21) 09/14/2021   02:51:40  (  79.25,  32.07)    2.93                26
 09/14/2021   03:41:25   ( -79.57,-158.04) 09/14/2021   03:42:16  ( -79.57,-158.05)    0.35                51
 09/16/2021   19:08:32   (  79.43, 149.21) 09/16/2021   19:08:31  (  79.43, 149.21)    0.22                 1
 09/16/2021   19:56:14   ( -81.82,  -5.79) 09/16/2021   19:57:27  ( -81.30,  -5.45)   58.50                73
 09/19/2021   10:35:41   ( -79.26,  96.30) 09/19/2021   10:34:48  ( -79.26,  96.34)    0.77                53
 09/19/2021   11:25:02   (  79.44, -94.84) 09/19/2021   11:25:27  (  79.43, -94.98)    2.99                25
 09/22/2021   02:52:10   ( -79.30,-147.53) 09/22/2021   02:51:43  ( -79.30,-147.60)    1.44                27
 09/22/2021   03:41:28   (  79.60,  22.13) 09/22/2021   03:42:18  (  79.60,  22.18)    1.21                50
 09/24/2021   19:08:38   ( -79.34, -31.40) 09/24/2021   19:08:37  ( -79.33, -31.54)    2.98                 1
 09/24/2021   19:56:22   (  81.80, 171.89) 09/24/2021   19:57:35  (  81.30, 172.23)   55.09                73
 09/27/2021   10:35:44   (  79.20, -84.06) 09/27/2021   10:34:51  (  79.20, -84.08)    0.44                53