Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2018 4 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)
 04/20/2018   14:41:09   (  70.17, -44.02) 04/20/2018   14:40:44  (  70.19, -44.05)    2.88                25
 04/20/2018   15:30:39   ( -70.05, 123.45) 04/20/2018   15:31:25  ( -70.04, 123.50)    2.18                46
 04/23/2018   06:08:09   ( -70.30, -95.60) 04/23/2018   06:06:56  ( -70.31, -95.77)    6.69                73
 04/23/2018   06:57:37   (  70.14,  71.82) 04/23/2018   06:57:39  (  70.15,  71.78)    2.08                 2
 04/23/2018   07:47:07   ( -70.02,-120.71) 04/23/2018   07:48:20  ( -69.99,-120.67)    3.52                73
 04/25/2018   22:24:37   ( -70.21,  20.16) 04/25/2018   22:23:49  ( -70.21,  20.14)    0.78                48
 04/25/2018   23:14:04   (  70.10,-172.35) 04/25/2018   23:14:33  (  70.11,-172.40)    2.00                29
 04/28/2018   13:51:23   (  70.94, -30.51) 04/28/2018   13:50:15  (  70.97, -32.62)   76.84                68
 04/28/2018   14:41:05   ( -70.18, 135.99) 04/28/2018   14:40:44  ( -70.18, 135.97)    0.82                21
 04/28/2018   15:30:32   (  70.07, -56.52) 04/28/2018   15:31:28  (  70.08, -56.57)    2.33                56
 05/01/2018   06:08:03   (  70.24,  84.33) 05/01/2018   06:06:57  (  70.25,  84.30)    1.69                66
 05/01/2018   06:57:33   ( -70.14,-108.19) 05/01/2018   06:57:39  ( -70.14,-108.21)    1.03                 6
 05/01/2018   07:47:06   (  69.69,  58.83) 05/01/2018   07:48:16  (  69.68,  59.80)   37.37                70
 05/03/2018   22:24:31   (  70.19,-159.86) 05/03/2018   22:23:51  (  70.17,-159.80)    3.35                40
 05/03/2018   23:14:01   ( -70.09,   7.63) 05/03/2018   23:14:34  ( -70.11,   7.61)    2.30                33