Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 27.  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)
 12/28/2017   18:22:42   (  68.70, -97.47) 12/28/2017   18:23:54  (  68.57, -96.90)   27.03                72
 12/28/2017   19:13:18   ( -68.28,  70.39) 12/28/2017   19:13:27  ( -68.30,  70.40)    1.28                 9
 12/28/2017   20:04:01   (  68.11,-122.08) 12/28/2017   20:02:55  (  68.13,-122.15)    3.38                66
 12/31/2017   10:39:30   (  68.39,  18.71) 12/31/2017   10:40:27  (  68.38,  18.75)    1.60                57
 12/31/2017   11:30:11   ( -68.24,-173.78) 12/31/2017   11:29:58  ( -68.22,-173.81)    2.97                13
 12/31/2017   12:20:44   (  67.53,  -5.59) 12/31/2017   12:19:34  (  67.60,  -6.88)   55.36                70
 01/03/2018   02:56:23   (  68.35, 134.54) 01/03/2018   02:56:57  (  68.35, 134.59)    2.25                34
 01/03/2018   03:47:04   ( -68.20, -57.95) 01/03/2018   03:46:28  ( -68.19, -57.97)    1.03                36
 01/05/2018   18:22:41   ( -68.96,  82.20) 01/05/2018   18:23:51  ( -68.88,  83.48)   52.00                70
 01/05/2018   19:13:14   (  68.26,-109.57) 01/05/2018   19:13:27  (  68.27,-109.63)    2.68                13
 01/05/2018   20:03:56   ( -68.16,  57.87) 01/05/2018   20:02:57  ( -68.16,  57.88)    0.44                59
 01/08/2018   10:39:24   ( -68.39,-161.27) 01/08/2018   10:40:29  ( -68.41,-161.23)    2.60                65
 01/08/2018   11:30:07   (  68.23,   6.25) 01/08/2018   11:29:57  (  68.23,   6.21)    1.86                10
 01/08/2018   12:20:44   ( -67.86, 174.03) 01/08/2018   12:19:31  ( -67.91, 173.46)   24.34                73