Simultaneous Nadir Overpasses (SNOs) between AURA and NPP
TLE Epoch: 2018 9 20.  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)
 09/22/2018   02:52:09   (  79.12,  31.21) 09/22/2018   02:51:26  (  79.12,  31.25)    0.85                43
 09/22/2018   03:41:28   ( -79.43,-159.10) 09/22/2018   03:42:02  ( -79.44,-158.95)    3.19                34
 09/24/2018   19:08:35   (  79.23, 147.79) 09/24/2018   19:08:19  (  79.24, 147.90)    2.45                16
 09/24/2018   19:57:57   ( -79.43, -43.24) 09/24/2018   19:58:59  ( -79.42, -43.33)    2.00                62
 09/27/2018   10:35:43   ( -78.99,  94.56) 09/27/2018   10:34:37  ( -78.99,  94.59)    0.75                66
 09/27/2018   11:25:02   (  79.26, -96.15) 09/27/2018   11:25:14  (  79.25, -96.23)    1.64                12
 09/30/2018   02:52:11   ( -79.01,-149.40) 09/30/2018   02:51:33  ( -79.01,-149.54)    3.10                38
 09/30/2018   03:41:27   (  79.39,  20.63) 09/30/2018   03:42:06  (  79.40,  20.69)    1.39                39
 10/02/2018   19:08:35   ( -79.19, -32.43) 10/02/2018   19:08:24  ( -79.19, -32.42)    0.17                11