Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 4 20.  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)
 04/22/2017   02:55:55   (  68.37, 134.60) 04/22/2017   02:56:52  (  68.35, 134.57)    2.91                57
 04/22/2017   03:46:36   ( -68.22, -57.89) 04/22/2017   03:46:22  ( -68.23, -57.93)    2.34                14
 04/22/2017   04:37:09   (  67.51, 110.30) 04/22/2017   04:35:59  (  67.57, 108.94)   58.23                70
 04/24/2017   19:12:50   (  68.33,-109.57) 04/24/2017   19:13:22  (  68.32,-109.58)    0.40                32
 04/24/2017   20:03:32   ( -68.23,  57.87) 04/24/2017   20:02:52  ( -68.22,  57.92)    2.87                40
 04/27/2017   10:39:09   ( -68.83,-161.78) 04/27/2017   10:40:20  ( -68.68,-160.92)   38.45                71
 04/27/2017   11:29:45   (  68.29,   6.25) 04/27/2017   11:29:52  (  68.29,   6.25)    0.26                 7
 04/27/2017   12:20:26   ( -68.14, 173.76) 04/27/2017   12:19:23  ( -68.12, 173.69)    2.94                63
 04/30/2017   02:55:55   ( -68.36, -45.39) 04/30/2017   02:56:54  ( -68.35, -45.44)    2.67                59
 04/30/2017   03:46:39   (  68.25, 122.06) 04/30/2017   03:46:21  (  68.23, 122.07)    1.94                18
 04/30/2017   04:37:10   ( -67.56, -69.76) 04/30/2017   04:36:00  ( -67.63, -71.00)   53.12                70
 05/02/2017   19:12:50   ( -68.33,  70.42) 05/02/2017   19:13:23  ( -68.34,  70.43)    0.94                33
 05/02/2017   20:03:34   (  68.22,-122.12) 05/02/2017   20:02:50  (  68.22,-122.07)    2.43                44