Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 4 19.  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)
 04/19/2018   19:12:58   ( -68.56,  70.09) 04/19/2018   19:14:10  ( -68.48,  70.47)   17.38                72
 04/19/2018   20:03:38   (  68.22,-122.17) 04/19/2018   20:03:40  (  68.22,-122.21)    1.94                 2
 04/19/2018   20:54:19   ( -68.08,  45.33) 04/19/2018   20:53:10  ( -68.10,  45.29)    3.14                69
 04/22/2018   11:29:50   ( -68.35,-173.87) 04/22/2018   11:30:44  ( -68.36,-173.81)    2.72                54
 04/22/2018   12:20:33   (  68.18,  -6.35) 04/22/2018   12:20:12  (  68.20,  -6.36)    2.18                21
 04/22/2018   13:11:03   ( -67.44, 161.88) 04/22/2018   13:09:53  ( -67.48, 160.44)   61.69                70
 04/25/2018   03:46:45   ( -68.31, -58.05) 04/25/2018   03:47:17  ( -68.29, -58.03)    2.11                32
 04/25/2018   04:37:28   (  68.15, 109.47) 04/25/2018   04:36:45  (  68.13, 109.43)    2.40                43
 04/27/2018   19:13:04   (  68.70,-110.10) 04/27/2018   19:14:15  (  68.61,-109.41)   29.74                71
 04/27/2018   20:03:40   ( -68.27,  57.77) 04/27/2018   20:03:49  ( -68.28,  57.82)    2.12                 9
 04/27/2018   20:54:23   (  68.11,-134.71) 04/27/2018   20:53:17  (  68.11,-134.73)    0.67                66
 04/30/2018   11:29:52   (  68.34,   6.14) 04/30/2018   11:30:50  (  68.36,   6.16)    2.37                58
 04/30/2018   12:20:33   ( -68.18, 173.66) 04/30/2018   12:20:21  ( -68.20, 173.60)    3.10                12
 04/30/2018   13:11:07   (  67.54, -18.24) 04/30/2018   13:09:57  (  67.58, -19.47)   52.65                70