Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 8.  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)
 12/10/2017   02:06:06   (  69.21, 146.05) 12/10/2017   02:07:14  (  69.13, 147.93)   74.86                68
 12/10/2017   02:56:33   ( -68.31, -45.42) 12/10/2017   02:56:57  ( -68.30, -45.48)    2.81                24
 12/10/2017   03:47:17   (  68.20, 122.02) 12/10/2017   03:46:24  (  68.18, 122.03)    1.77                53
 12/12/2017   18:22:45   (  68.39, -97.07) 12/12/2017   18:23:54  (  68.40, -97.10)    1.80                69
 12/12/2017   19:13:26   ( -68.29,  70.38) 12/12/2017   19:13:23  ( -68.29,  70.40)    1.25                 3
 12/12/2017   20:04:06   (  67.96,-121.91) 12/12/2017   20:02:53  (  68.01,-122.28)   16.62                73
 12/15/2017   10:39:38   (  68.36,  18.73) 12/15/2017   10:40:20  (  68.37,  18.76)    1.18                42
 12/15/2017   11:30:19   ( -68.20,-173.75) 12/15/2017   11:29:51  ( -68.21,-173.81)    2.43                28
 12/18/2017   02:06:01   ( -69.13, -33.83) 12/18/2017   02:07:10  ( -68.98, -32.23)   65.72                69
 12/18/2017   02:56:32   (  68.34, 134.54) 12/18/2017   02:56:47  (  68.31, 134.58)    3.18                15
 12/18/2017   03:47:13   ( -68.17, -57.94) 12/18/2017   03:46:18  ( -68.15, -57.98)    3.22                55
 12/20/2017   18:22:42   ( -68.40,  82.91) 12/20/2017   18:23:46  ( -68.40,  82.94)    1.14                64
 12/20/2017   19:13:25   (  68.25,-109.58) 12/20/2017   19:13:14  (  68.23,-109.62)    2.90                11
 12/20/2017   20:04:01   ( -67.82,  58.28) 12/20/2017   20:02:49  ( -67.84,  57.56)   30.24                72