Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 12 13.  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   03:47:18   (  68.18, 122.05) 12/13/2018   03:46:28  (  68.18, 122.01)    1.86                50
 12/15/2018   18:22:48   (  68.50, -97.22) 12/15/2018   18:23:59  (  68.45, -97.06)    8.72                71
 12/15/2018   19:13:28   ( -68.31,  70.35) 12/15/2018   19:13:30  ( -68.29,  70.37)    2.42                 2
 12/15/2018   20:04:11   (  68.13,-122.12) 12/15/2018   20:02:58  (  68.12,-122.18)    2.73                73
 12/18/2018   10:39:40   (  68.35,  18.74) 12/18/2018   10:40:31  (  68.35,  18.70)    1.82                51
 12/18/2018   11:30:22   ( -68.26,-173.82) 12/18/2018   11:30:01  ( -68.25,-173.80)    1.67                21
 12/18/2018   12:20:50   (  67.28,  -5.31) 12/18/2018   12:19:42  (  67.35,  -7.18)   80.75                68
 12/21/2018   02:56:34   (  68.31, 134.56) 12/21/2018   02:57:02  (  68.33, 134.54)    1.72                28
 12/21/2018   03:47:16   ( -68.22, -58.00) 12/21/2018   03:46:32  ( -68.23, -57.95)    2.22                44
 12/23/2018   18:22:51   ( -68.76,  82.43) 12/23/2018   18:24:02  ( -68.66,  83.17)   31.89                71
 12/23/2018   19:13:28   (  68.28,-109.63) 12/23/2018   19:13:34  (  68.26,-109.67)    2.51                 6
 12/23/2018   20:04:10   ( -68.18,  57.82) 12/23/2018   20:03:04  ( -68.16,  57.85)    2.12                66
 12/26/2018   10:39:38   ( -68.40,-161.33) 12/26/2018   10:40:37  ( -68.39,-161.29)    2.60                59
 12/26/2018   11:30:21   (  68.25,   6.19) 12/26/2018   11:30:04  (  68.27,   6.21)    2.53                17
 12/26/2018   12:20:53   ( -67.60, 174.30) 12/26/2018   12:19:43  ( -67.67, 173.15)   49.37                70