Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2017 12 18.  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)
 12/18/2017   22:25:34   ( -70.37,  20.44) 12/18/2017   22:24:22  ( -70.40,  19.79)   24.82                72
 12/18/2017   23:15:05   (  70.05,-172.37) 12/18/2017   23:15:01  (  70.04,-172.33)    2.61                 4
 12/19/2017   00:04:35   ( -69.94,  -4.90) 12/19/2017   00:05:43  ( -69.94,  -4.87)    1.09                68
 12/21/2017   14:42:07   ( -70.14, 135.98) 12/21/2017   14:41:10  ( -70.14, 135.97)    0.53                57
 12/21/2017   15:31:34   (  70.04, -56.52) 12/21/2017   15:31:54  (  70.04, -56.56)    1.66                20
 12/21/2017   16:21:16   ( -69.27, 110.07) 12/21/2017   16:22:24  ( -69.30, 111.83)   69.63                68
 12/24/2017   06:58:37   ( -70.12,-108.17) 12/24/2017   06:58:03  ( -70.09,-108.18)    3.26                34
 12/24/2017   07:48:04   (  70.01,  59.32) 12/24/2017   07:48:47  (  69.99,  59.29)    3.08                43
 12/26/2017   22:25:32   (  70.47,-159.42) 12/26/2017   22:24:21  (  70.52,-160.39)   36.34                71
 12/26/2017   23:15:07   ( -70.09,   7.67) 12/26/2017   23:14:57  ( -70.09,   7.59)    2.96                10
 12/27/2017   00:04:35   (  69.93, 175.08) 12/27/2017   00:05:40  (  69.94, 175.13)    2.56                65
 12/29/2017   14:42:07   (  70.16, -43.99) 12/29/2017   14:41:08  (  70.15, -44.05)    2.05                59
 12/29/2017   15:31:37   ( -70.06, 123.49) 12/29/2017   15:31:50  ( -70.05, 123.43)    2.44                13
 12/29/2017   16:21:14   (  69.34, -69.85) 12/29/2017   16:22:22  (  69.37, -68.25)   62.56                68
 01/01/2018   06:58:36   (  70.12,  71.82) 01/01/2018   06:58:00  (  70.11,  71.79)    1.07                36
 01/01/2018   07:48:06   ( -70.01,-120.69) 01/01/2018   07:48:42  ( -70.00,-120.73)    1.75                36