Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 28.  Predictions up to the next  14.0 days:

     Date     Time(NPP) NPP Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2017   18:22:43   (  68.73, -97.51) 12/28/2017   18:23:54  (  68.60, -96.86)   29.82                71
 12/28/2017   19:13:18   ( -68.26,  70.42) 12/28/2017   19:13:28  ( -68.27,  70.36)    2.19                10
 12/28/2017   20:04:02   (  68.15,-122.12) 12/28/2017   20:02:55  (  68.16,-122.12)    1.52                67
 12/31/2017   10:39:30   (  68.37,  18.74) 12/31/2017   10:40:28  (  68.36,  18.72)    1.06                58
 12/31/2017   11:30:12   ( -68.27,-173.82) 12/31/2017   11:29:58  ( -68.25,-173.77)    2.87                14
 12/31/2017   12:20:45   (  67.56,  -5.63) 12/31/2017   12:19:35  (  67.58,  -6.91)   54.32                70
 01/03/2018   02:56:22   (  68.33, 134.57) 01/03/2018   02:56:57  (  68.35, 134.58)    2.35                35
 01/03/2018   03:47:03   ( -68.18, -57.92) 01/03/2018   03:46:28  ( -68.19, -57.98)    2.38                35
 01/05/2018   18:22:42   ( -68.99,  82.16) 01/05/2018   18:23:52  ( -68.89,  83.49)   54.24                70
 01/05/2018   19:13:15   (  68.29,-109.61) 01/05/2018   19:13:28  (  68.28,-109.62)    1.35                13
 01/05/2018   20:03:57   ( -68.19,  57.83) 01/05/2018   20:02:58  ( -68.18,  57.89)    2.93                59
 01/08/2018   10:39:24   ( -68.36,-161.24) 01/08/2018   10:40:31  ( -68.38,-161.26)    2.66                67
 01/08/2018   11:30:08   (  68.25,   6.21) 01/08/2018   11:29:58  (  68.27,   6.24)    1.94                10
 01/08/2018   12:20:45   ( -67.89, 173.99) 01/08/2018   12:19:32  ( -67.94, 173.49)   21.83                73
 01/11/2018   02:56:17   ( -68.33, -45.42) 01/11/2018   02:57:02  ( -68.32, -45.46)    2.08                45
 01/11/2018   03:47:01   (  68.22, 122.03) 01/11/2018   03:46:29  (  68.20, 122.04)    1.89                32