Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 1 10.  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)
 01/11/2018   02:56:17   ( -68.34, -45.43) 01/11/2018   02:56:59  ( -68.33, -45.43)    0.37                42
 01/11/2018   03:47:01   (  68.21, 122.04) 01/11/2018   03:46:26  (  68.23, 122.09)    2.91                35
 01/13/2018   18:22:39   (  69.03, -97.90) 01/13/2018   18:23:48  (  68.94, -96.43)   59.32                69
 01/13/2018   19:13:09   ( -68.30,  70.39) 01/13/2018   19:13:27  ( -68.33,  70.44)    3.30                18
 01/13/2018   20:03:53   (  68.18,-122.15) 01/13/2018   20:02:55  (  68.16,-122.11)    2.45                58
 01/16/2018   10:39:20   (  68.36,  18.77) 01/16/2018   10:40:27  (  68.36,  18.73)    1.72                67
 01/16/2018   11:30:02   ( -68.27,-173.80) 01/16/2018   11:29:57  ( -68.25,-173.77)    2.68                 5
 01/16/2018   12:20:40   (  67.83,  -5.93) 01/16/2018   12:19:28  (  67.92,  -6.52)   26.42                72
 01/19/2018   02:56:13   (  68.34, 134.58) 01/19/2018   02:56:56  (  68.33, 134.57)    0.82                43
 01/19/2018   03:46:54   ( -68.19, -57.92) 01/19/2018   03:46:26  ( -68.22, -57.92)    3.20                28
 01/21/2018   18:22:37   ( -69.23,  81.85) 01/21/2018   18:23:45  ( -69.12,  83.80)   78.27                68
 01/21/2018   19:13:06   (  68.31,-109.61) 01/21/2018   19:13:25  (  68.28,-109.60)    3.32                19
 01/21/2018   20:03:47   ( -68.17,  57.89) 01/21/2018   20:02:55  ( -68.18,  57.91)    1.61                52