Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 10 21.  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)
 10/23/2017   02:06:15   (  69.14, 146.20) 10/23/2017   02:07:24  (  69.00, 147.64)   59.39                69
 10/23/2017   02:56:45   ( -68.42, -45.52) 10/23/2017   02:57:03  ( -68.40, -45.47)    3.16                18
 10/23/2017   03:47:28   (  68.23, 122.03) 10/23/2017   03:46:31  (  68.23, 121.96)    2.79                57
 10/25/2017   18:22:58   (  68.49, -97.16) 10/25/2017   18:24:03  (  68.47, -97.14)    2.14                65
 10/25/2017   19:13:39   ( -68.36,  70.32) 10/25/2017   19:13:33  ( -68.38,  70.38)    2.91                 6
 10/25/2017   20:04:17   (  67.90,-121.79) 10/25/2017   20:03:05  (  67.98,-122.45)   28.86                72
 10/28/2017   10:39:52   (  68.43,  18.67) 10/28/2017   10:40:34  (  68.44,  18.69)    0.99                42
 10/28/2017   11:30:33   ( -68.30,-173.83) 10/28/2017   11:30:05  ( -68.29,-173.85)    1.26                28
 10/31/2017   02:06:18   ( -69.36, -34.12) 10/31/2017   02:07:26  ( -69.25, -32.07)   81.68                68
 10/31/2017   02:56:46   (  68.38, 134.51) 10/31/2017   02:57:06  (  68.40, 134.52)    2.51                20
 10/31/2017   03:47:27   ( -68.24, -57.99) 10/31/2017   03:46:37  ( -68.26, -58.03)    2.03                50
 11/02/2017   18:22:58   ( -68.61,  82.67) 11/02/2017   18:24:10  ( -68.54,  82.90)   12.27                72
 11/02/2017   19:13:40   (  68.38,-109.72) 11/02/2017   19:13:38  (  68.36,-109.67)    3.29                 2
 11/02/2017   20:04:21   ( -68.24,  57.77) 11/02/2017   20:03:09  ( -68.22,  57.79)    2.88                72