Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 6 21.  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)
 06/22/2017   10:39:10   (  68.83,  18.24) 06/22/2017   10:40:20  (  68.74,  19.16)   38.54                70
 06/22/2017   11:29:43   ( -68.28,-173.72) 06/22/2017   11:29:56  ( -68.31,-173.74)    2.64                13
 06/22/2017   12:20:28   (  68.20,  -6.30) 06/22/2017   12:19:23  (  68.19,  -6.24)    2.70                65
 06/25/2017   02:55:56   (  68.36, 134.63) 06/25/2017   02:56:55  (  68.39, 134.61)    3.33                59
 06/25/2017   03:46:37   ( -68.24, -57.89) 06/25/2017   03:46:26  ( -68.24, -57.94)    2.40                11
 06/25/2017   04:37:12   (  67.61, 110.20) 06/25/2017   04:36:01  (  67.67, 109.04)   49.39                71
 06/27/2017   19:12:50   (  68.33,-109.54) 06/27/2017   19:13:25  (  68.31,-109.61)    3.03                35
 06/27/2017   20:03:31   ( -68.20,  57.94) 06/27/2017   20:02:55  ( -68.22,  57.91)    2.59                36
 06/30/2017   10:39:08   ( -68.90,-161.83) 06/30/2017   10:40:19  ( -68.79,-160.78)   43.65                71
 06/30/2017   11:29:43   (  68.29,   6.28) 06/30/2017   11:29:53  (  68.28,   6.24)    2.06                10
 06/30/2017   12:20:25   ( -68.21, 173.70) 06/30/2017   12:19:23  ( -68.18, 173.75)    3.28                62
 07/03/2017   02:55:53   ( -68.38, -45.36) 07/03/2017   02:56:55  ( -68.37, -45.43)    2.82                62
 07/03/2017   03:46:37   (  68.25, 122.10) 07/03/2017   03:46:22  (  68.24, 122.07)    1.90                15
 07/03/2017   04:37:10   ( -67.68, -69.87) 07/03/2017   04:35:59  ( -67.76, -70.86)   42.80                71
 07/05/2017   19:12:47   ( -68.34,  70.46) 07/05/2017   19:13:24  ( -68.32,  70.40)    3.31                37
 07/05/2017   20:03:31   (  68.22,-122.08) 07/05/2017   20:02:51  (  68.19,-122.11)    3.10                40