Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 12 19.  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)
 12/21/2018   02:56:34   (  68.30, 134.58) 12/21/2018   02:57:00  (  68.31, 134.53)    2.91                26
 12/21/2018   03:47:16   ( -68.21, -57.99) 12/21/2018   03:46:30  ( -68.21, -57.97)    0.72                46
 12/23/2018   18:22:48   ( -68.64,  82.59) 12/23/2018   18:23:59  ( -68.56,  83.06)   20.81                71
 12/23/2018   19:13:27   (  68.26,-109.60) 12/23/2018   19:13:29  (  68.28,-109.63)    3.03                 2
 12/23/2018   20:04:09   ( -68.16,  57.84) 12/23/2018   20:02:59  ( -68.18,  57.88)    2.30                70
 12/26/2018   10:39:38   ( -68.38,-161.30) 12/26/2018   10:40:32  ( -68.37,-161.30)    2.06                54
 12/26/2018   11:30:21   (  68.22,   6.22) 12/26/2018   11:29:59  (  68.25,   6.21)    3.23                22
 12/26/2018   12:20:50   ( -67.42, 174.52) 12/26/2018   12:19:41  ( -67.48, 172.95)   67.22                69
 12/29/2018   02:56:32   ( -68.34, -45.48) 12/29/2018   02:57:02  ( -68.33, -45.46)    1.57                30
 12/29/2018   03:47:15   (  68.18, 122.03) 12/29/2018   03:46:29  (  68.21, 122.05)    3.37                46
 12/31/2018   18:22:48   (  68.63, -97.40) 12/31/2018   18:23:59  (  68.56, -96.93)   20.25                71
 12/31/2018   19:13:26   ( -68.31,  70.34) 12/31/2018   19:13:32  ( -68.30,  70.38)    2.04                 6
 12/31/2018   20:04:09   (  68.15,-122.15) 12/31/2018   20:03:00  (  68.12,-122.18)    3.34                69