Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2013 12 14.  Predictions up to the next  14.0 days:

     Date     Time(NPP)   NPP Lat/Lon  TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 12/15/2013   01:16:48   ( -68.58, -20.49) ( -68.61, -20.52)    3.27                70
 12/15/2013   02:07:32   (  68.44, 147.00) (  68.46, 146.94)    2.96                 6
 12/15/2013   02:58:11   ( -68.21, -45.38) ( -68.23, -45.70)   13.46                73
 12/17/2013   17:33:46   ( -68.56,  95.30) ( -68.57,  95.27)    1.63                50
 12/17/2013   18:24:30   (  68.42, -97.21) (  68.42, -97.27)    2.31                26
 12/17/2013   19:14:56   ( -67.48,  71.28) ( -67.53,  69.33)   83.13                68
 12/20/2013   09:50:45   ( -68.55,-148.92) ( -68.56,-148.92)    1.38                34
 12/20/2013   10:41:29   (  68.41,  18.57) (  68.41,  18.54)    1.32                42
 12/23/2013   01:17:17   (  69.42, 158.32) (  69.28, 160.17)   74.03                68
 12/23/2013   02:07:44   ( -68.54, -33.14) ( -68.52, -33.16)    2.82                23
 12/23/2013   02:58:28   (  68.41, 134.34) (  68.42, 134.36)    1.68                54
 12/25/2013   17:34:11   (  69.16, -85.54) (  69.03, -84.37)   48.71                70
 12/25/2013   18:24:43   ( -68.55,  82.62) ( -68.56,  82.67)    2.53                15
 12/25/2013   19:15:27   (  68.41,-109.90) (  68.41,-109.87)    1.37                61