Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 18.  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)
 12/20/2017   18:22:44   ( -68.65,  82.60) 12/20/2017   18:23:55  ( -68.57,  83.10)   22.07                71
 12/20/2017   19:13:23   (  68.26,-109.60) 12/20/2017   19:13:25  (  68.30,-109.59)    3.50                 2
 12/20/2017   20:04:04   ( -68.12,  57.91) 12/20/2017   20:02:56  ( -68.13,  57.85)    2.86                68
 12/23/2017   10:39:33   ( -68.38,-161.28) 12/23/2017   10:40:30  ( -68.38,-161.26)    0.85                57
 12/23/2017   11:30:16   (  68.21,   6.24) 12/23/2017   11:29:58  (  68.22,   6.19)    2.12                18
 12/23/2017   12:20:47   ( -67.53, 174.41) 12/23/2017   12:19:37  ( -67.61, 173.12)   55.68                70
 12/26/2017   02:56:26   ( -68.33, -45.44) 12/26/2017   02:57:03  ( -68.35, -45.42)    2.72                37
 12/26/2017   03:47:09   (  68.17, 122.08) 12/26/2017   03:46:31  (  68.19, 122.02)    3.39                38
 12/28/2017   18:22:48   (  69.02, -97.91) 12/28/2017   18:23:57  (  68.92, -96.49)   57.70                69
 12/28/2017   19:13:19   ( -68.33,  70.33) 12/28/2017   19:13:36  ( -68.31,  70.39)    3.43                17
 12/28/2017   20:04:02   (  68.17,-122.16) 12/28/2017   20:03:04  (  68.15,-122.16)    2.81                58
 12/31/2017   10:39:30   (  68.39,  18.71) 12/31/2017   10:40:41  (  68.36,  18.68)    3.18                71
 12/31/2017   11:30:12   ( -68.29,-173.84) 12/31/2017   11:30:11  ( -68.26,-173.81)    2.84                 1
 12/31/2017   12:20:53   (  68.02,  -6.19) 12/31/2017   12:19:40  (  68.04,  -6.43)   10.07                73