Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 23.  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)
 04/25/2018   03:46:45   ( -68.30, -58.03) 04/25/2018   03:47:17  ( -68.29, -58.04)    1.10                32
 04/25/2018   04:37:29   (  68.18, 109.43) 04/25/2018   04:36:44  (  68.18, 109.48)    2.06                45
 04/27/2018   19:13:03   (  68.68,-110.08) 04/27/2018   19:14:14  (  68.58,-109.46)   27.63                71
 04/27/2018   20:03:39   ( -68.26,  57.79) 04/27/2018   20:03:48  ( -68.25,  57.77)    1.53                 9
 04/27/2018   20:54:23   (  68.15,-134.76) 04/27/2018   20:53:15  (  68.14,-134.71)    2.33                68
 04/30/2018   11:29:52   (  68.32,   6.16) 04/30/2018   11:30:49  (  68.35,   6.14)    3.35                57
 04/30/2018   12:20:34   ( -68.22, 173.60) 04/30/2018   12:20:19  ( -68.25, 173.65)    3.18                15
 04/30/2018   13:11:06   (  67.47, -18.15) 04/30/2018   13:09:57  (  67.52, -19.55)   59.76                69
 05/03/2018   03:46:47   (  68.30, 121.96) 05/03/2018   03:47:21  (  68.29, 121.93)    1.63                34
 05/03/2018   04:37:29   ( -68.19, -70.59) 05/03/2018   04:36:51  ( -68.18, -70.56)    1.74                38
 05/05/2018   19:13:08   ( -68.91,  69.61) 05/05/2018   19:14:18  ( -68.76,  70.74)   48.18                70
 05/05/2018   20:03:42   (  68.27,-122.23) 05/05/2018   20:03:52  (  68.26,-122.22)    0.86                10
 05/05/2018   20:54:24   ( -68.17,  45.22) 05/05/2018   20:53:22  ( -68.16,  45.29)    2.88                62