Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 31.  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)
 12/31/2017   10:39:29   (  68.35,  18.77) 12/31/2017   10:40:27  (  68.37,  18.72)    2.65                58
 12/31/2017   11:30:11   ( -68.26,-173.80) 12/31/2017   11:29:57  ( -68.26,-173.77)    1.30                14
 12/31/2017   12:20:44   (  67.55,  -5.61) 12/31/2017   12:19:34  (  67.59,  -6.91)   55.24                70
 01/03/2018   02:56:22   (  68.31, 134.59) 01/03/2018   02:56:57  (  68.33, 134.56)    3.18                35
 01/03/2018   03:47:04   ( -68.22, -57.97) 01/03/2018   03:46:27  ( -68.23, -57.93)    2.27                37
 01/05/2018   18:22:42   ( -68.97,  82.18) 01/05/2018   18:23:52  ( -68.86,  83.44)   52.23                70
 01/05/2018   19:13:15   (  68.27,-109.58) 01/05/2018   19:13:27  (  68.30,-109.60)    3.22                12
 01/05/2018   20:03:57   ( -68.18,  57.85) 01/05/2018   20:02:57  ( -68.19,  57.91)    2.97                60
 01/08/2018   10:39:25   ( -68.40,-161.29) 01/08/2018   10:40:30  ( -68.37,-161.28)    3.26                65
 01/08/2018   11:30:07   (  68.23,   6.24) 01/08/2018   11:29:56  (  68.26,   6.23)    2.59                11
 01/08/2018   12:20:43   ( -67.82, 174.08) 01/08/2018   12:19:31  ( -67.87, 173.41)   28.54                72
 01/11/2018   02:56:16   ( -68.31, -45.40) 01/11/2018   02:56:59  ( -68.33, -45.45)    2.87                43
 01/11/2018   03:47:00   (  68.20, 122.06) 01/11/2018   03:46:26  (  68.21, 122.05)    1.23                34
 01/13/2018   18:22:40   (  69.07, -97.95) 01/13/2018   18:23:49  (  68.93, -96.45)   61.62                69
 01/13/2018   19:13:09   ( -68.28,  70.42) 01/13/2018   19:13:29  ( -68.28,  70.37)    2.31                20
 01/13/2018   20:03:53   (  68.17,-122.13) 01/13/2018   20:02:56  (  68.16,-122.13)    0.87                57