Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2015 12 21.  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)
 12/21/2015   02:07:48   (  68.50, 147.10) 12/21/2015   02:07:39  (  68.49, 147.05)    1.79                 9
 12/21/2015   02:58:25   ( -68.14, -45.13) 12/21/2015   02:57:13  ( -68.17, -45.70)   23.97                72
 12/23/2015   17:33:58   ( -68.64,  95.36) 12/23/2015   17:34:48  ( -68.62,  95.42)    3.16                50
 12/23/2015   18:24:41   (  68.47, -97.10) 12/23/2015   18:24:16  (  68.46, -97.14)    2.27                25
 12/23/2015   19:15:08   ( -67.58,  71.34) 12/23/2015   19:13:59  ( -67.64,  69.53)   76.77                69
 12/26/2015   09:50:49   ( -68.57,-148.77) 12/26/2015   09:51:28  ( -68.60,-148.78)    2.75                39
 12/26/2015   10:41:33   (  68.46,  18.69) 12/26/2015   10:40:56  (  68.43,  18.66)    2.89                37
 12/29/2015   02:07:42   ( -68.56, -32.98) 12/29/2015   02:08:13  ( -68.58, -32.99)    2.21                31
 12/29/2015   02:58:26   (  68.44, 134.48) 12/29/2015   02:57:41  (  68.42, 134.45)    3.17                45
 12/31/2015   17:34:11   (  69.61, -85.97) 12/31/2015   17:35:17  (  69.49, -83.66)   90.82                66
 12/31/2015   18:24:35   ( -68.56,  82.80) 12/31/2015   18:25:02  ( -68.57,  82.80)    2.11                27
 12/31/2015   19:15:19   (  68.44,-109.74) 12/31/2015   19:14:30  (  68.41,-109.76)    3.02                49
 01/03/2016   09:51:04   (  69.61,  29.80) 01/03/2016   09:52:10  (  69.49,  32.11)   90.95                66
 01/03/2016   10:41:28   ( -68.55,-161.43) 01/03/2016   10:41:55  ( -68.58,-161.42)    2.45                27
 01/03/2016   11:32:12   (  68.44,   6.03) 01/03/2016   11:31:23  (  68.42,   6.03)    2.45                49