Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 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)
 04/22/2018   11:29:50   ( -68.35,-173.87) 04/22/2018   11:30:44  ( -68.36,-173.82)    2.73                54
 04/22/2018   12:20:33   (  68.18,  -6.34) 04/22/2018   12:20:12  (  68.21,  -6.36)    3.33                21
 04/22/2018   13:11:03   ( -67.44, 161.89) 04/22/2018   13:09:53  ( -67.48, 160.44)   62.13                70
 04/25/2018   03:46:45   ( -68.31, -58.04) 04/25/2018   03:47:17  ( -68.29, -58.03)    1.64                32
 04/25/2018   04:37:28   (  68.14, 109.48) 04/25/2018   04:36:45  (  68.13, 109.42)    2.41                43
 04/27/2018   19:13:04   (  68.69,-110.10) 04/27/2018   19:14:15  (  68.60,-109.42)   29.04                71
 04/27/2018   20:03:40   ( -68.27,  57.78) 04/27/2018   20:03:49  ( -68.27,  57.81)    1.48                 9
 04/27/2018   20:54:22   (  68.10,-134.71) 04/27/2018   20:53:16  (  68.11,-134.74)    1.39                66
 04/30/2018   11:29:52   (  68.34,   6.14) 04/30/2018   11:30:50  (  68.36,   6.15)    2.24                58
 04/30/2018   12:20:34   ( -68.23, 173.59) 04/30/2018   12:20:20  ( -68.25, 173.65)    2.94                14
 04/30/2018   13:11:07   (  67.53, -18.23) 04/30/2018   13:09:57  (  67.58, -19.48)   53.37                70
 05/03/2018   03:46:47   (  68.30, 121.95) 05/03/2018   03:47:22  (  68.33, 121.98)    2.49                35
 05/03/2018   04:37:28   ( -68.15, -70.53) 05/03/2018   04:36:53  ( -68.16, -70.58)    2.99                35