Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 12 10.  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)
 12/13/2018   02:06:09   (  69.29, 145.93) 12/13/2018   02:07:16  (  69.21, 148.01)   82.52                67
 12/13/2018   02:56:34   ( -68.30, -45.41) 12/13/2018   02:57:00  ( -68.32, -45.47)    3.51                26
 12/13/2018   03:47:19   (  68.23, 121.99) 12/13/2018   03:46:27  (  68.21, 122.05)    3.05                52
 12/15/2018   18:22:47   (  68.45, -97.15) 12/15/2018   18:23:58  (  68.43, -97.09)    3.04                71
 12/15/2018   19:13:28   ( -68.30,  70.36) 12/15/2018   19:13:28  ( -68.32,  70.41)    3.31                 0
 12/15/2018   20:04:10   (  68.07,-122.05) 12/15/2018   20:02:57  (  68.10,-122.21)    7.07                73
 12/18/2018   10:39:40   (  68.35,  18.75) 12/18/2018   10:40:28  (  68.36,  18.70)    1.89                48
 12/18/2018   11:30:22   ( -68.25,-173.81) 12/18/2018   11:29:58  ( -68.25,-173.79)    1.12                24
 12/18/2018   12:20:48   (  67.16,  -5.18) 12/18/2018   12:19:41  (  67.24,  -7.30)   91.87                67
 12/21/2018   02:06:08   ( -69.38, -34.19) 12/21/2018   02:07:15  ( -69.27, -31.91)   90.30                67
 12/21/2018   02:56:34   (  68.31, 134.57) 12/21/2018   02:56:57  (  68.32, 134.55)    1.73                23
 12/21/2018   03:47:16   ( -68.21, -57.99) 12/21/2018   03:46:27  ( -68.22, -57.94)    2.35                49
 12/23/2018   18:22:46   ( -68.48,  82.80) 12/23/2018   18:23:58  ( -68.45,  82.94)    6.69                72
 12/23/2018   19:13:28   (  68.27,-109.61) 12/23/2018   19:13:26  (  68.27,-109.63)    0.87                 2
 12/23/2018   20:04:10   ( -68.17,  57.84) 12/23/2018   20:02:56  ( -68.17,  57.88)    2.11                74