Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2017 9 13.  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)
 09/13/2017   22:25:33   ( -70.13,  20.15) 09/13/2017   22:24:22  ( -70.14,  20.22)    3.09                71
 09/13/2017   23:15:00   (  70.03,-172.34) 09/13/2017   23:15:06  (  70.02,-172.29)    2.32                 6
 09/14/2017   00:04:33   ( -69.75,  -5.10) 09/14/2017   00:05:45  ( -69.78,  -4.60)   19.58                72
 09/16/2017   14:42:01   ( -70.12, 136.02) 09/16/2017   14:41:17  ( -70.09, 136.06)    3.24                44
 09/16/2017   15:31:28   (  70.02, -56.48) 09/16/2017   15:32:02  (  70.03, -56.53)    2.11                34
 09/19/2017   06:08:52   (  70.65,  85.05) 09/19/2017   06:07:42  (  70.72,  83.53)   56.50                70
 09/19/2017   06:58:30   ( -70.10,-108.12) 09/19/2017   06:58:14  ( -70.10,-108.18)    2.31                16
 09/19/2017   07:47:57   (  70.00,  59.38) 09/19/2017   07:48:58  (  69.98,  59.31)    3.08                61
 09/21/2017   22:25:30   (  70.14,-159.82) 09/21/2017   22:24:28  (  70.15,-159.80)    1.40                62
 09/21/2017   23:15:00   ( -70.03,   7.66) 09/21/2017   23:15:10  ( -70.05,   7.66)    2.76                10
 09/22/2017   00:04:36   (  69.42, 174.47) 09/22/2017   00:05:45  (  69.46, 175.85)   53.94                69
 09/24/2017   14:41:59   (  70.11, -43.98) 09/24/2017   14:41:24  (  70.11, -43.97)    0.48                35
 09/24/2017   15:31:29   ( -70.01, 123.51) 09/24/2017   15:32:06  ( -70.01, 123.49)    1.12                37
 09/27/2017   06:08:54   ( -70.52, -95.14) 09/27/2017   06:07:43  ( -70.60, -96.29)   43.49                71
 09/27/2017   06:58:27   (  70.08,  71.86) 09/27/2017   06:58:19  (  70.07,  71.86)    1.03                 8
 09/27/2017   07:47:57   ( -69.98,-120.65) 09/27/2017   07:49:01  ( -69.97,-120.68)    1.32                64