Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 9 19.  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)
 09/21/2017   02:56:40   ( -68.41, -45.53) 09/21/2017   02:57:18  ( -68.40, -45.52)    1.98                38
 09/21/2017   03:47:24   (  68.28, 121.95) 09/21/2017   03:46:45  (  68.29, 122.00)    2.14                39
 09/23/2017   18:23:02   (  68.88, -97.70) 09/23/2017   18:24:12  (  68.76, -96.82)   37.61                70
 09/23/2017   19:13:36   ( -68.37,  70.29) 09/23/2017   19:13:47  ( -68.38,  70.34)    1.91                11
 09/23/2017   20:04:20   (  68.24,-122.23) 09/23/2017   20:03:15  (  68.21,-122.22)    3.41                65
 09/26/2017   10:39:51   (  68.46,  18.62) 09/26/2017   10:40:46  (  68.46,  18.68)    2.51                55
 09/26/2017   11:30:32   ( -68.33,-173.88) 09/26/2017   11:30:17  ( -68.30,-173.88)    3.03                15
 09/26/2017   12:21:04   (  67.55,  -5.61) 09/26/2017   12:19:55  (  67.57,  -7.08)   62.72                69
 09/29/2017   02:56:45   (  68.37, 134.51) 09/29/2017   02:57:15  (  68.38, 134.47)    2.21                30
 09/29/2017   03:47:27   ( -68.29, -58.06) 09/29/2017   03:46:45  ( -68.28, -58.02)    1.85                42
 10/01/2017   18:23:02   ( -68.73,  82.50) 10/01/2017   18:24:14  ( -68.64,  83.02)   22.94                72
 10/01/2017   19:13:41   (  68.33,-109.67) 10/01/2017   19:13:44  (  68.36,-109.68)    2.95                 3
 10/01/2017   20:04:22   ( -68.19,  57.82) 10/01/2017   20:03:15  ( -68.20,  57.77)    2.55                67