Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 18.  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)
 12/20/2017   18:22:44   ( -68.63,  82.63) 12/20/2017   18:23:56  ( -68.52,  83.05)   20.46                72
 12/20/2017   19:13:24   (  68.30,-109.64) 12/20/2017   19:13:25  (  68.31,-109.57)    2.88                 1
 12/20/2017   20:04:05   ( -68.15,  57.87) 12/20/2017   20:02:56  ( -68.14,  57.86)    0.92                69
 12/23/2017   10:39:32   ( -68.36,-161.25) 12/23/2017   10:40:29  ( -68.38,-161.26)    2.32                57
 12/23/2017   11:30:16   (  68.25,   6.20) 12/23/2017   11:29:56  (  68.27,   6.26)    3.56                20
 12/23/2017   12:20:46   ( -67.51, 174.44) 12/23/2017   12:19:36  ( -67.61, 173.12)   57.09                70
 12/26/2017   02:56:25   ( -68.31, -45.41) 12/26/2017   02:57:02  ( -68.33, -45.45)    2.74                37
 12/26/2017   03:47:09   (  68.20, 122.04) 12/26/2017   03:46:29  (  68.22, 122.06)    2.55                40
 12/28/2017   18:22:48   (  69.01, -97.88) 12/28/2017   18:23:57  (  68.87, -96.55)   55.33                69
 12/28/2017   19:13:19   ( -68.31,  70.35) 12/28/2017   19:13:35  ( -68.32,  70.40)    2.21                16
 12/28/2017   20:04:02   (  68.15,-122.13) 12/28/2017   20:03:03  (  68.15,-122.15)    0.78                59
 12/31/2017   10:39:30   (  68.37,  18.74) 12/31/2017   10:40:39  (  68.39,  18.72)    2.24                69
 12/31/2017   11:30:12   ( -68.27,-173.82) 12/31/2017   11:30:09  ( -68.29,-173.76)    3.29                 3
 12/31/2017   12:20:52   (  67.95,  -6.10) 12/31/2017   12:19:39  (  68.01,  -6.45)   16.30                73