Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 17.  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)
 12/18/2017   02:06:05   ( -69.45, -34.28) 12/18/2017   02:07:11  ( -69.34, -31.80)   97.85                66
 12/18/2017   02:56:30   (  68.32, 134.56) 12/18/2017   02:56:54  (  68.35, 134.59)    3.24                24
 12/18/2017   03:47:11   ( -68.17, -57.93) 12/18/2017   03:46:25  ( -68.18, -57.97)    1.78                46
 12/20/2017   18:22:46   ( -68.75,  82.46) 12/20/2017   18:23:57  ( -68.64,  83.17)   31.52                71
 12/20/2017   19:13:23   (  68.27,-109.60) 12/20/2017   19:13:29  (  68.25,-109.66)    2.88                 6
 12/20/2017   20:04:05   ( -68.17,  57.84) 12/20/2017   20:02:59  ( -68.15,  57.86)    2.44                66
 12/23/2017   10:39:33   ( -68.38,-161.28) 12/23/2017   10:40:37  ( -68.40,-161.26)    2.81                64
 12/23/2017   11:30:17   (  68.27,   6.17) 12/23/2017   11:30:05  (  68.24,   6.18)    3.41                12
 12/23/2017   12:20:52   ( -67.79, 174.09) 12/23/2017   12:19:40  ( -67.86, 173.37)   30.83                72
 12/26/2017   02:56:27   ( -68.38, -45.51) 12/26/2017   02:57:16  ( -68.36, -45.47)    2.64                49
 12/26/2017   03:47:10   (  68.22, 122.01) 12/26/2017   03:46:44  (  68.19, 121.97)    3.25                26
 12/26/2017   04:37:36   ( -67.26, -69.50) 12/26/2017   04:36:28  ( -67.32, -71.40)   81.99                68
 12/28/2017   19:13:19   ( -68.33,  70.33) 12/28/2017   19:13:56  ( -68.34,  70.33)    1.05                37
 12/28/2017   20:04:02   (  68.17,-122.16) 12/28/2017   20:03:24  (  68.17,-122.22)    2.65                38