Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2015 12 20.  Predictions up to the next  14.0 days:

     Date     Time(LANDSAT-8) LANDSAT-8 Lat/Lon Date Time(NPP) NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/21/2015   21:36:05   ( -70.33,  32.76) 12/21/2015   21:35:34  ( -70.33,  32.68)    2.92                31
 12/21/2015   22:25:33   (  70.17,-159.82) 12/21/2015   22:26:17  (  70.16,-159.76)    2.42                44
 12/24/2015   13:03:01   (  70.61, -18.58) 12/24/2015   13:01:50  (  70.66, -19.40)   30.99                71
 12/24/2015   13:52:35   ( -70.28, 148.57) 12/24/2015   13:52:26  ( -70.25, 148.56)    2.63                 9
 12/24/2015   14:42:03   (  70.12, -44.02) 12/24/2015   14:43:10  (  70.14, -43.96)    3.47                67
 12/27/2015   05:19:35   (  70.33,  96.88) 12/27/2015   05:18:37  (  70.33,  96.89)    0.64                58
 12/27/2015   06:09:04   ( -70.22, -95.64) 12/27/2015   06:09:18  ( -70.24, -95.64)    2.22                14
 12/27/2015   06:58:42   (  69.51,  71.01) 12/27/2015   06:59:50  (  69.49,  72.78)   68.80                68
 12/29/2015   21:36:03   (  70.31,-147.26) 12/29/2015   21:35:29  (  70.32,-147.32)    2.65                34
 12/29/2015   22:25:33   ( -70.20,  20.22) 12/29/2015   22:26:10  ( -70.18,  20.23)    3.05                37
 01/01/2016   13:02:57   ( -70.83, 161.75) 01/01/2016   13:01:47  ( -70.90, 160.22)   56.24                70
 01/01/2016   13:52:32   (  70.28, -31.42) 01/01/2016   13:52:21  (  70.27, -31.46)    2.09                11
 01/01/2016   14:42:02   ( -70.18, 136.06) 01/01/2016   14:43:03  ( -70.17, 136.01)    2.15                61