Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 12 18.  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)
 12/18/2018   10:39:41   (  68.38,  18.70) 12/18/2018   10:40:29  (  68.40,  18.76)    3.18                48
 12/18/2018   11:30:22   ( -68.24,-173.80) 12/18/2018   11:30:00  ( -68.24,-173.81)    0.61                22
 12/18/2018   12:20:49   (  67.20,  -5.22) 12/18/2018   12:19:42  (  67.29,  -7.25)   87.96                67
 12/21/2018   02:06:10   ( -69.47, -34.33) 12/21/2018   02:07:16  ( -69.36, -31.80)   99.65                66
 12/21/2018   02:56:34   (  68.29, 134.59) 12/21/2018   02:57:00  (  68.31, 134.52)    3.51                26
 12/21/2018   03:47:16   ( -68.20, -57.98) 12/21/2018   03:46:30  ( -68.20, -57.97)    0.49                46
 12/23/2018   18:22:48   ( -68.63,  82.60) 12/23/2018   18:23:59  ( -68.55,  83.04)   20.28                71
 12/23/2018   19:13:27   (  68.25,-109.59) 12/23/2018   19:13:29  (  68.26,-109.65)    2.86                 2
 12/23/2018   20:04:09   ( -68.16,  57.85) 12/23/2018   20:02:59  ( -68.16,  57.86)    0.64                70
 12/26/2018   10:39:38   ( -68.38,-161.30) 12/26/2018   10:40:31  ( -68.39,-161.27)    1.25                53
 12/26/2018   11:30:21   (  68.22,   6.22) 12/26/2018   11:29:59  (  68.21,   6.17)    2.41                22
 12/26/2018   12:20:50   ( -67.42, 174.52) 12/26/2018   12:19:41  ( -67.44, 172.91)   68.94                69
 12/29/2018   02:06:09   (  69.46, 145.68) 12/29/2018   02:07:15  (  69.32, 148.16)   98.10                66
 12/29/2018   02:56:32   ( -68.34, -45.48) 12/29/2018   02:57:01  ( -68.33, -45.46)    1.40                29
 12/29/2018   03:47:15   (  68.18, 122.04) 12/29/2018   03:46:28  (  68.21, 122.04)    3.27                47
 12/31/2018   18:22:47   (  68.57, -97.33) 12/31/2018   18:23:58  (  68.54, -96.96)   15.51                71
 12/31/2018   19:13:25   ( -68.25,  70.41) 12/31/2018   19:13:31  ( -68.27,  70.35)    2.96                 6
 12/31/2018   20:04:09   (  68.15,-122.15) 12/31/2018   20:02:58  (  68.15,-122.15)    0.34                71