Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 8 20.  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)
 08/20/2018   11:30:12   (  68.44,   6.04) 08/20/2018   11:31:11  (  68.42,   6.10)    3.53                59
 08/20/2018   12:20:53   ( -68.29, 173.54) 08/20/2018   12:20:41  ( -68.31, 173.60)    2.93                12
 08/20/2018   13:11:27   (  67.63, -18.32) 08/20/2018   13:10:17  (  67.69, -19.47)   48.89                70
 08/23/2018   03:47:07   (  68.34, 121.93) 08/23/2018   03:47:41  (  68.33, 121.88)    2.48                34
 08/23/2018   04:37:49   ( -68.24, -70.62) 08/23/2018   04:37:11  ( -68.22, -70.62)    2.22                38
 08/25/2018   19:13:26   ( -68.83,  69.74) 08/25/2018   19:14:37  ( -68.68,  70.54)   36.38                71
 08/25/2018   20:04:02   (  68.29,-122.24) 08/25/2018   20:04:09  (  68.29,-122.29)    1.94                 7
 08/25/2018   20:54:44   ( -68.19,  45.20) 08/25/2018   20:53:39  ( -68.19,  45.22)    0.96                65
 08/28/2018   11:30:15   ( -68.41,-173.94) 08/28/2018   11:31:10  ( -68.42,-173.90)    1.74                55
 08/28/2018   12:20:58   (  68.25,  -6.42) 08/28/2018   12:20:38  (  68.25,  -6.46)    1.72                20
 08/28/2018   13:11:28   ( -67.50, 161.83) 08/28/2018   13:10:18  ( -67.59, 160.41)   61.21                70
 08/31/2018   02:56:47   (  69.44, 133.11) 08/31/2018   02:57:53  (  69.37, 135.55)   95.46                66
 08/31/2018   03:47:11   ( -68.37, -58.11) 08/31/2018   03:47:39  ( -68.37, -58.08)    1.52                28
 08/31/2018   04:37:54   (  68.21, 109.40) 08/31/2018   04:37:07  (  68.20, 109.36)    1.84                47
 09/02/2018   19:13:26   (  68.49,-109.82) 09/02/2018   19:14:37  (  68.48,-109.70)    4.80                71
 09/02/2018   20:04:07   ( -68.32,  57.71) 09/02/2018   20:04:08  ( -68.32,  57.74)    1.27                 1
 09/02/2018   20:54:49   (  68.11,-134.71) 09/02/2018   20:53:36  (  68.15,-134.82)    5.84                73