Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 9 19.  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)
 09/21/2017   02:56:40   ( -68.42, -45.54) 09/21/2017   02:57:18  ( -68.39, -45.53)    3.43                38
 09/21/2017   03:47:24   (  68.29, 121.94) 09/21/2017   03:46:45  (  68.28, 121.99)    2.13                39
 09/23/2017   18:23:01   (  68.83, -97.64) 09/23/2017   18:24:12  (  68.75, -96.84)   33.31                71
 09/23/2017   19:13:36   ( -68.37,  70.29) 09/23/2017   19:13:47  ( -68.36,  70.32)    1.81                11
 09/23/2017   20:04:20   (  68.24,-122.24) 09/23/2017   20:03:14  (  68.25,-122.17)    2.87                66
 09/26/2017   10:39:50   (  68.41,  18.69) 09/26/2017   10:40:46  (  68.44,  18.66)    3.11                56
 09/26/2017   11:30:32   ( -68.33,-173.89) 09/26/2017   11:30:16  ( -68.33,-173.84)    2.14                16
 09/26/2017   12:21:04   (  67.55,  -5.61) 09/26/2017   12:19:54  (  67.60,  -7.04)   60.99                70
 09/29/2017   02:56:46   (  68.43, 134.44) 09/29/2017   02:57:14  (  68.41, 134.50)    3.39                28
 09/29/2017   03:47:26   ( -68.23, -58.00) 09/29/2017   03:46:45  ( -68.25, -58.06)    2.96                41
 10/01/2017   18:23:02   ( -68.73,  82.50) 10/01/2017   18:24:13  ( -68.65,  83.03)   23.03                71
 10/01/2017   19:13:41   (  68.33,-109.68) 10/01/2017   19:13:44  (  68.31,-109.74)    3.39                 3
 10/01/2017   20:04:22   ( -68.19,  57.82) 10/01/2017   20:03:14  ( -68.21,  57.78)    2.69                68