Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 12 12.  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   (  69.33, 145.89) 12/13/2018   02:07:16  (  69.18, 147.98)   84.19                67
 12/13/2018   02:56:34   ( -68.33, -45.45) 12/13/2018   02:56:59  ( -68.35, -45.43)    2.27                25
 12/13/2018   03:47:18   (  68.21, 122.01) 12/13/2018   03:46:27  (  68.18, 122.02)    2.62                51
 12/15/2018   18:22:47   (  68.43, -97.12) 12/15/2018   18:23:59  (  68.41, -97.10)    1.78                72
 12/15/2018   19:13:28   ( -68.28,  70.38) 12/15/2018   19:13:29  ( -68.31,  70.40)    2.80                 1
 12/15/2018   20:04:10   (  68.05,-122.02) 12/15/2018   20:02:58  (  68.08,-122.22)    8.71                72
 12/18/2018   10:39:40   (  68.33,  18.77) 12/18/2018   10:40:29  (  68.35,  18.70)    3.47                49
 12/18/2018   11:30:22   ( -68.24,-173.79) 12/18/2018   11:29:59  ( -68.25,-173.79)    1.33                23
 12/18/2018   12:20:49   (  67.20,  -5.22) 12/18/2018   12:19:42  (  67.23,  -7.30)   89.70                67
 12/21/2018   02:06:08   ( -69.42, -34.24) 12/21/2018   02:07:14  ( -69.34, -31.81)   95.51                66
 12/21/2018   02:56:34   (  68.35, 134.52) 12/21/2018   02:56:57  (  68.33, 134.56)    2.52                23
 12/21/2018   03:47:15   ( -68.19, -57.97) 12/21/2018   03:46:28  ( -68.18, -57.99)    2.20                47
 12/23/2018   18:22:46   ( -68.52,  82.75) 12/23/2018   18:23:58  ( -68.48,  82.98)   10.81                72
 12/23/2018   19:13:27   (  68.26,-109.60) 12/23/2018   19:13:27  (  68.24,-109.66)    3.12                 0
 12/23/2018   20:04:09   ( -68.16,  57.85) 12/23/2018   20:02:57  ( -68.15,  57.86)    1.23                72