Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 6 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)
 06/20/2018   05:28:02   (  67.50,  97.62) 06/20/2018   05:26:53  (  67.56,  96.26)   57.93                69
 06/22/2018   20:03:41   (  68.31,-122.25) 06/22/2018   20:04:15  (  68.31,-122.26)    0.64                34
 06/22/2018   20:54:22   ( -68.19,  45.23) 06/22/2018   20:53:45  ( -68.21,  45.25)    2.22                37
 06/25/2018   11:30:01   ( -68.94,-174.62) 06/25/2018   11:31:11  ( -68.79,-173.44)   50.06                70
 06/25/2018   12:20:35   (  68.27,  -6.42) 06/25/2018   12:20:45  (  68.28,  -6.42)    0.96                10
 06/25/2018   13:11:16   ( -68.15, 161.06) 06/25/2018   13:10:16  ( -68.13, 161.03)    2.55                60
 06/28/2018   03:46:45   ( -68.37, -58.08) 06/28/2018   03:47:48  ( -68.37, -58.08)    0.27                63
 06/28/2018   04:37:29   (  68.24, 109.40) 06/28/2018   04:37:15  (  68.25, 109.42)    1.44                14
 06/28/2018   05:28:03   ( -67.73, -82.65) 06/28/2018   05:26:51  ( -67.82, -83.46)   35.34                72
 06/30/2018   20:03:39   ( -68.33,  57.75) 06/30/2018   20:04:18  ( -68.33,  57.75)    0.14                39
 06/30/2018   20:54:23   (  68.20,-134.78) 06/30/2018   20:53:45  (  68.21,-134.75)    1.33                38
 07/03/2018   11:30:00   (  68.92,   5.43) 07/03/2018   11:31:10  (  68.77,   6.53)   47.24                70
 07/03/2018   12:20:32   ( -68.30, 173.57) 07/03/2018   12:20:47  ( -68.29, 173.58)    0.86                15
 07/03/2018   13:11:16   (  68.17, -18.96) 07/03/2018   13:10:14  (  68.17, -18.93)    1.69                62