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   ( -70.33,  20.38) 12/18/2017   22:24:21  ( -70.40,  19.80)   22.92                73
 12/18/2017   23:15:04   (  70.06,-172.36) 12/18/2017   23:15:01  (  70.08,-172.40)    2.53                 3
 12/19/2017   00:04:34   ( -69.95,  -4.88) 12/19/2017   00:05:42  ( -69.93,  -4.86)    2.44                68
 12/21/2017   14:42:07   ( -70.15, 136.00) 12/21/2017   14:41:10  ( -70.13, 135.98)    2.04                57
 12/21/2017   15:31:34   (  70.05, -56.50) 12/21/2017   15:31:54  (  70.03, -56.55)    2.58                20
 12/21/2017   16:21:16   ( -69.28, 110.08) 12/21/2017   16:22:24  ( -69.29, 111.84)   69.51                68
 12/24/2017   06:58:38   ( -70.08,-108.23) 12/24/2017   06:58:03  ( -70.08,-108.16)    2.60                35
 12/24/2017   07:48:05   (  69.97,  59.26) 12/24/2017   07:48:47  (  69.98,  59.30)    1.84                42
 12/26/2017   22:25:32   (  70.49,-159.40) 12/26/2017   22:24:21  (  70.51,-160.37)   36.28                71
 12/26/2017   23:15:08   ( -70.05,   7.61) 12/26/2017   23:14:56  ( -70.03,   7.68)    3.56                12
 12/27/2017   00:04:35   (  69.94, 175.10) 12/27/2017   00:05:40  (  69.93, 175.14)    1.93                65
 12/29/2017   14:42:07   (  70.12, -44.05) 12/29/2017   14:41:07  (  70.14, -44.03)    2.67                60
 12/29/2017   15:31:37   ( -70.02, 123.44) 12/29/2017   15:31:49  ( -70.04, 123.45)    2.12                12
 12/29/2017   16:21:14   (  69.35, -69.82) 12/29/2017   16:22:22  (  69.36, -68.24)   62.16                68