Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 9 14.  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   ( -69.16,  81.92) 09/15/2017   18:24:10  ( -69.04,  83.52)   64.92                69
 09/15/2017   19:13:32   (  68.34,-109.67) 09/15/2017   19:13:47  (  68.37,-109.67)    3.26                15
 09/15/2017   20:04:13   ( -68.21,  57.83) 09/15/2017   20:03:18  ( -68.21,  57.78)    2.26                55
 09/18/2017   10:39:45   ( -68.48,-161.38) 09/18/2017   10:40:49  ( -68.46,-161.33)    2.99                64
 09/18/2017   11:30:28   (  68.29,   6.16) 09/18/2017   11:30:17  (  68.28,   6.11)    2.70                11
 09/18/2017   12:21:04   ( -67.89, 173.99) 09/18/2017   12:19:52  ( -67.90, 173.29)   29.52                72
 09/21/2017   02:56:40   ( -68.43, -45.55) 09/21/2017   02:57:17  ( -68.41, -45.50)    2.67                37
 09/21/2017   03:47:23   (  68.25, 121.99) 09/21/2017   03:46:45  (  68.24, 121.93)    2.44                38
 09/23/2017   18:23:01   (  68.85, -97.66) 09/23/2017   18:24:11  (  68.74, -96.85)   34.67                70
 09/23/2017   19:13:36   ( -68.39,  70.27) 09/23/2017   19:13:46  ( -68.36,  70.32)    3.15                10
 09/23/2017   20:04:19   (  68.21,-122.19) 09/23/2017   20:03:14  (  68.19,-122.25)    3.20                65
 09/26/2017   10:39:50   (  68.43,  18.66) 09/26/2017   10:40:44  (  68.46,  18.68)    2.84                54
 09/26/2017   11:30:31   ( -68.29,-173.84) 09/26/2017   11:30:15  ( -68.30,-173.87)    1.85                16
 09/26/2017   12:21:02   (  67.47,  -5.51) 09/26/2017   12:19:53  (  67.56,  -7.08)   68.01                69