Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 9 13.  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)
 09/15/2017   18:23:01   ( -69.17,  81.92) 09/15/2017   18:24:10  ( -69.03,  83.50)   64.93                69
 09/15/2017   19:13:32   (  68.35,-109.67) 09/15/2017   19:13:47  (  68.36,-109.68)    1.09                15
 09/15/2017   20:04:13   ( -68.21,  57.82) 09/15/2017   20:03:18  ( -68.20,  57.76)    3.08                55
 09/18/2017   10:39:44   ( -68.42,-161.31) 09/18/2017   10:40:49  ( -68.43,-161.36)    2.10                65
 09/18/2017   11:30:28   (  68.30,   6.16) 09/18/2017   11:30:16  (  68.31,   6.14)    1.37                12
 09/18/2017   12:21:03   ( -67.84, 174.06) 09/18/2017   12:19:51  ( -67.93, 173.32)   32.37                72
 09/21/2017   02:56:41   ( -68.43, -45.55) 09/21/2017   02:57:17  ( -68.42, -45.49)    2.83                36
 09/21/2017   03:47:24   (  68.25, 121.99) 09/21/2017   03:46:45  (  68.24, 121.95)    1.80                39
 09/23/2017   18:23:00   (  68.79, -97.59) 09/23/2017   18:24:11  (  68.67, -96.94)   29.83                71
 09/23/2017   19:13:35   ( -68.33,  70.34) 09/23/2017   19:13:45  ( -68.34,  70.30)    2.24                10
 09/23/2017   20:04:19   (  68.21,-122.19) 09/23/2017   20:03:12  (  68.22,-122.20)    1.71                67
 09/26/2017   10:39:50   (  68.43,  18.66) 09/26/2017   10:40:43  (  68.40,  18.63)    3.20                53
 09/26/2017   11:30:31   ( -68.29,-173.83) 09/26/2017   11:30:13  ( -68.31,-173.86)    2.40                18
 09/26/2017   12:21:01   (  67.41,  -5.44) 09/26/2017   12:19:53  (  67.45,  -7.20)   75.34                68