Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 6.  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)
 04/09/2018   02:56:12   (  69.11, 133.58) 04/09/2018   02:57:20  (  68.98, 135.26)   68.08                68
 04/09/2018   03:46:40   ( -68.26, -57.98) 04/09/2018   03:47:01  ( -68.26, -58.00)    1.04                21
 04/09/2018   04:37:24   (  68.14, 109.48) 04/09/2018   04:36:28  (  68.15, 109.52)    1.78                56
 04/11/2018   19:12:54   (  68.36,-109.65) 04/11/2018   19:14:04  (  68.34,-109.67)    2.23                70
 04/11/2018   20:03:35   ( -68.21,  57.86) 04/11/2018   20:03:34  ( -68.24,  57.84)    3.00                 1
 04/11/2018   20:54:16   (  67.93,-134.48) 04/11/2018   20:53:03  (  68.02,-134.78)   15.37                73
 04/14/2018   11:29:49   (  68.32,   6.18) 04/14/2018   11:30:37  (  68.32,   6.17)    0.80                48
 04/14/2018   12:20:31   ( -68.22, 173.62) 04/14/2018   12:20:07  ( -68.22, 173.68)    2.44                24
 04/14/2018   13:10:57   (  67.13, -17.75) 04/14/2018   13:09:50  (  67.21, -19.83)   90.17                67
 04/17/2018   03:46:43   (  68.27, 122.00) 04/17/2018   03:47:10  (  68.25, 121.95)    3.17                27
 04/17/2018   04:37:25   ( -68.17, -70.55) 04/17/2018   04:36:40  ( -68.15, -70.54)    2.07                45
 04/19/2018   19:13:01   ( -68.71,  69.88) 04/19/2018   19:14:12  ( -68.58,  70.57)   31.20                71
 04/19/2018   20:03:38   (  68.23,-122.18) 04/19/2018   20:03:43  (  68.24,-122.20)    1.25                 5
 04/19/2018   20:54:20   ( -68.13,  45.27) 04/19/2018   20:53:13  ( -68.15,  45.32)    2.87                67