Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 9 11.  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)
 09/13/2017   02:56:36   (  68.39, 134.51) 09/13/2017   02:57:18  (  68.40, 134.49)    1.30                42
 09/13/2017   03:47:18   ( -68.30, -58.06) 09/13/2017   03:46:48  ( -68.29, -58.01)    2.80                30
 09/15/2017   18:23:01   ( -69.16,  81.93) 09/15/2017   18:24:10  ( -69.04,  83.52)   64.52                69
 09/15/2017   19:13:33   (  68.39,-109.73) 09/15/2017   19:13:47  (  68.37,-109.66)    3.53                14
 09/15/2017   20:04:13   ( -68.20,  57.84) 09/15/2017   20:03:18  ( -68.21,  57.78)    2.81                55
 09/18/2017   10:39:45   ( -68.47,-161.37) 09/18/2017   10:40:49  ( -68.45,-161.33)    2.40                64
 09/18/2017   11:30:28   (  68.29,   6.17) 09/18/2017   11:30:17  (  68.28,   6.11)    2.59                11
 09/18/2017   12:21:04   ( -67.88, 174.00) 09/18/2017   12:19:52  ( -67.90, 173.29)   29.75                72
 09/21/2017   02:56:40   ( -68.42, -45.55) 09/21/2017   02:57:17  ( -68.41, -45.50)    2.34                37
 09/21/2017   03:47:23   (  68.25, 121.99) 09/21/2017   03:46:45  (  68.24, 121.94)    2.38                38
 09/23/2017   18:23:01   (  68.85, -97.66) 09/23/2017   18:24:11  (  68.74, -96.85)   34.91                70
 09/23/2017   19:13:36   ( -68.38,  70.28) 09/23/2017   19:13:46  ( -68.36,  70.32)    3.03                10
 09/23/2017   20:04:19   (  68.21,-122.19) 09/23/2017   20:03:14  (  68.19,-122.24)    3.23                65