Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 9 14.  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)
 09/16/2018   02:56:46   (  68.93, 133.80) 09/16/2018   02:57:56  (  68.83, 134.88)   44.41                70
 09/16/2018   03:47:19   ( -68.36, -58.11) 09/16/2018   03:47:33  ( -68.33, -58.11)    2.89                14
 09/16/2018   04:38:03   (  68.24, 109.35) 09/16/2018   04:37:00  (  68.22, 109.41)    3.19                63
 09/18/2018   19:13:33   (  68.43,-109.75) 09/18/2018   19:14:30  (  68.43,-109.74)    0.43                57
 09/18/2018   20:04:14   ( -68.28,  57.76) 09/18/2018   20:04:01  ( -68.27,  57.70)    2.77                13
 09/18/2018   20:54:47   (  67.57,-134.04) 09/18/2018   20:53:37  (  67.64,-135.38)   57.16                70
 09/21/2018   11:30:28   (  68.40,   6.05) 09/21/2018   11:30:56  (  68.38,   6.09)    2.90                28
 09/21/2018   12:21:09   ( -68.25, 173.56) 09/21/2018   12:20:27  ( -68.22, 173.54)    3.38                42
 09/24/2018   02:56:42   ( -68.60, -45.75) 09/24/2018   02:57:54  ( -68.54, -45.47)   13.35                72
 09/24/2018   03:47:23   (  68.33, 121.92) 09/24/2018   03:47:23  (  68.30, 121.89)    2.72                 0
 09/24/2018   04:38:04   ( -68.18, -70.57) 09/24/2018   04:36:53  ( -68.21, -70.59)    3.34                71
 09/26/2018   19:13:35   ( -68.42,  70.26) 09/26/2018   19:14:21  ( -68.44,  70.30)    2.52                46
 09/26/2018   20:04:18   (  68.25,-122.22) 09/26/2018   20:03:49  (  68.25,-122.27)    2.28                29
 09/26/2018   20:54:42   ( -67.19,  46.41) 09/26/2018   20:53:35  ( -67.26,  44.23)   94.23                67