Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2018 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)
 12/29/2018   02:06:09   (  69.45, 145.70) 12/29/2018   02:07:15  (  69.34, 148.18)   98.03                66
 12/29/2018   02:56:32   ( -68.34, -45.48) 12/29/2018   02:57:01  ( -68.34, -45.45)    1.15                29
 12/29/2018   03:47:15   (  68.17, 122.05) 12/29/2018   03:46:29  (  68.18, 122.00)    2.11                46
 12/31/2018   18:22:46   (  68.56, -97.31) 12/31/2018   18:23:58  (  68.50, -97.01)   14.28                72
 12/31/2018   19:13:25   ( -68.30,  70.34) 12/31/2018   19:13:30  ( -68.28,  70.36)    3.05                 5
 12/31/2018   20:04:08   (  68.14,-122.14) 12/31/2018   20:02:57  (  68.17,-122.13)    3.44                71
 01/03/2019   10:39:37   (  68.37,  18.71) 01/03/2019   10:40:29  (  68.37,  18.72)    0.50                52
 01/03/2019   11:30:18   ( -68.22,-173.78) 01/03/2019   11:30:00  ( -68.21,-173.84)    2.91                18
 01/03/2019   12:20:48   (  67.35,  -5.41) 01/03/2019   12:19:39  (  67.42,  -7.10)   72.98                69
 01/06/2019   02:56:31   (  68.35, 134.51) 01/06/2019   02:56:58  (  68.34, 134.57)    2.27                27
 01/06/2019   03:47:12   ( -68.19, -57.97) 01/06/2019   03:46:29  ( -68.18, -57.99)    1.08                43
 01/08/2019   18:22:46   ( -68.69,  82.52) 01/08/2019   18:23:57  ( -68.59,  83.11)   26.35                71
 01/08/2019   19:13:24   (  68.27,-109.62) 01/08/2019   19:13:28  (  68.25,-109.66)    2.73                 4
 01/08/2019   20:04:06   ( -68.16,  57.83) 01/08/2019   20:02:58  ( -68.15,  57.85)    1.78                68