Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 16.  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)
 12/18/2017   02:06:04   ( -69.39, -34.20) 12/18/2017   02:07:11  ( -69.29, -31.87)   92.01                67
 12/18/2017   02:56:30   (  68.32, 134.56) 12/18/2017   02:56:53  (  68.35, 134.59)    3.31                23
 12/18/2017   03:47:11   ( -68.17, -57.93) 12/18/2017   03:46:24  ( -68.18, -57.97)    2.23                47
 12/20/2017   18:22:44   ( -68.64,  82.60) 12/20/2017   18:23:55  ( -68.58,  83.10)   21.39                71
 12/20/2017   19:13:23   (  68.26,-109.59) 12/20/2017   19:13:26  (  68.25,-109.66)    3.42                 3
 12/20/2017   20:04:05   ( -68.17,  57.85) 12/20/2017   20:02:56  ( -68.14,  57.85)    3.10                69
 12/23/2017   10:39:33   ( -68.38,-161.27) 12/23/2017   10:40:31  ( -68.39,-161.27)    1.40                58
 12/23/2017   11:30:16   (  68.21,   6.24) 12/23/2017   11:29:59  (  68.22,   6.18)    2.86                17
 12/23/2017   12:20:48   ( -67.58, 174.35) 12/23/2017   12:19:38  ( -67.62, 173.11)   52.77                70
 12/26/2017   02:56:26   ( -68.32, -45.43) 12/26/2017   02:57:06  ( -68.33, -45.47)    1.86                40
 12/26/2017   03:47:10   (  68.22, 122.01) 12/26/2017   03:46:33  (  68.22, 122.04)    1.30                37
 12/28/2017   18:22:51   (  69.18, -98.13) 12/28/2017   18:23:59  (  69.07, -96.34)   72.09                68
 12/28/2017   19:13:19   ( -68.33,  70.33) 12/28/2017   19:13:41  ( -68.30,  70.34)    3.40                22
 12/28/2017   20:04:02   (  68.17,-122.15) 12/28/2017   20:03:08  (  68.19,-122.15)    2.11                54