Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2017 12 11.  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)
 12/12/2017   18:22:44   (  68.38, -97.06) 12/12/2017   18:23:55  (  68.40, -97.11)    3.09                71
 12/12/2017   19:13:26   ( -68.28,  70.38) 12/12/2017   19:13:25  ( -68.29,  70.40)    1.28                 1
 12/12/2017   20:04:07   (  68.01,-121.96) 12/12/2017   20:02:54  (  68.06,-122.23)   12.83                73
 12/15/2017   10:39:38   (  68.37,  18.72) 12/15/2017   10:40:23  (  68.38,  18.76)    2.20                45
 12/15/2017   11:30:19   ( -68.23,-173.77) 12/15/2017   11:29:54  ( -68.23,-173.79)    0.88                25
 12/15/2017   12:20:44   (  67.08,  -5.08) 12/15/2017   12:19:38  (  67.15,  -7.37)   99.49                66
 12/18/2017   02:06:03   ( -69.34, -34.12) 12/18/2017   02:07:10  ( -69.21, -31.95)   86.31                67
 12/18/2017   02:56:30   (  68.32, 134.56) 12/18/2017   02:56:51  (  68.32, 134.57)    0.31                21
 12/18/2017   03:47:11   ( -68.17, -57.93) 12/18/2017   03:46:22  ( -68.16, -57.98)    2.38                49
 12/20/2017   18:22:40   ( -68.43,  82.89) 12/20/2017   18:23:52  ( -68.43,  82.95)    2.44                72
 12/20/2017   19:13:23   (  68.27,-109.60) 12/20/2017   19:13:20  (  68.25,-109.62)    1.82                 3
 12/20/2017   20:04:04   ( -68.11,  57.92) 12/20/2017   20:02:51  ( -68.10,  57.83)    3.95                73
 12/23/2017   10:39:33   ( -68.38,-161.27) 12/23/2017   10:40:21  ( -68.37,-161.24)    1.48                48
 12/23/2017   11:30:16   (  68.22,   6.24) 12/23/2017   11:29:48  (  68.25,   6.26)    3.19                28
 12/23/2017   12:20:41   ( -67.20, 174.80) 12/23/2017   12:19:34  ( -67.25, 172.75)   88.37                67