Simultaneous Nadir Overpasses (SNOs) between NPP and TERRA
TLE Epoch: 2012 4 20.  Predictions up to the next  14.0 days:

     Date     Time(NPP)   NPP Lat/Lon  TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 04/21/2012   11:29:07   ( -68.32,-173.88) ( -68.31,-173.82)    2.45                32
 04/21/2012   12:19:50   (  68.12,  -6.32) (  68.14,  -6.38)    3.39                43
 04/24/2012   02:55:25   (  68.72, 134.04) (  68.63, 134.80)   32.51                71
 04/24/2012   03:45:59   ( -68.22, -57.99) ( -68.25, -58.03)    3.12                12
 04/24/2012   04:36:44   (  68.14, 109.43) (  68.13, 109.48)    2.42                66
 04/26/2012   19:12:11   (  68.32,-109.66) (  68.32,-109.70)    1.86                61
 04/26/2012   20:02:52   ( -68.19,  57.82) ( -68.22,  57.82)    3.29                10
 04/26/2012   20:53:28   (  67.62,-134.16) (  67.65,-135.20)   43.87                71
 04/29/2012   11:29:03   (  68.29,   6.14) (  68.27,   6.12)    2.89                39
 04/29/2012   12:19:44   ( -68.17, 173.62) ( -68.18, 173.64)    0.90                32
 05/02/2012   02:55:25   ( -69.11, -46.47) ( -68.99, -44.76)   69.32                69
 05/02/2012   03:45:56   (  68.28, 121.94) (  68.26, 121.98)    3.17                16
 05/02/2012   04:36:36   ( -68.10, -70.51) ( -68.11, -70.57)    2.37                53