Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 16.  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)
 04/17/2018   02:56:18   ( -69.38, -46.81) 04/17/2018   02:57:24  ( -69.29, -44.37)   95.97                66
 04/17/2018   03:46:44   (  68.30, 121.96) 04/17/2018   03:47:07  (  68.30, 122.02)    2.59                23
 04/17/2018   04:37:25   ( -68.16, -70.53) 04/17/2018   04:36:38  ( -68.14, -70.54)    2.17                47
 04/19/2018   19:12:59   ( -68.59,  70.05) 04/19/2018   19:14:10  ( -68.51,  70.50)   20.25                71
 04/19/2018   20:03:38   (  68.20,-122.14) 04/19/2018   20:03:40  (  68.23,-122.19)    3.34                 2
 04/19/2018   20:54:20   ( -68.11,  45.29) 04/19/2018   20:53:10  ( -68.12,  45.32)    2.05                70
 04/22/2018   11:29:50   ( -68.33,-173.84) 04/22/2018   11:30:45  ( -68.32,-173.86)    0.89                55
 04/22/2018   12:20:34   (  68.22,  -6.39) 04/22/2018   12:20:12  (  68.21,  -6.35)    2.09                22
 04/22/2018   13:11:03   ( -67.42, 161.91) 04/22/2018   13:09:53  ( -67.49, 160.46)   62.44                70
 04/25/2018   03:46:44   ( -68.29, -58.02) 04/25/2018   03:47:16  ( -68.30, -58.02)    1.36                32
 04/25/2018   04:37:28   (  68.18, 109.43) 04/25/2018   04:36:43  (  68.18, 109.49)    2.77                45
 04/27/2018   19:13:03   (  68.68,-110.08) 04/27/2018   19:14:14  (  68.59,-109.42)   28.06                71
 04/27/2018   20:03:39   ( -68.25,  57.80) 04/27/2018   20:03:48  ( -68.27,  57.82)    2.48                 9
 04/27/2018   20:54:22   (  68.09,-134.69) 04/27/2018   20:53:16  (  68.10,-134.74)    2.32                66