Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2017 4 21.  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)
 04/22/2017   22:24:47   ( -70.25,  20.21) 04/22/2017   22:23:43  ( -70.25,  20.13)    2.88                64
 04/22/2017   23:14:15   (  70.09,-172.37) 04/22/2017   23:14:26  (  70.09,-172.31)    2.30                11
 04/23/2017   00:03:51   ( -69.64,  -5.35) 04/23/2017   00:05:01  ( -69.62,  -4.29)   41.10                70
 04/25/2017   14:41:15   ( -70.20, 136.03) 04/25/2017   14:40:38  ( -70.20, 135.97)    2.16                37
 04/25/2017   15:30:42   (  70.10, -56.48) 04/25/2017   15:31:22  (  70.10, -56.56)    2.97                40
 04/28/2017   06:08:07   (  70.53,  84.76) 04/28/2017   06:06:56  (  70.58,  83.82)   34.92                71
 04/28/2017   06:57:42   ( -70.15,-108.17) 04/28/2017   06:57:32  ( -70.16,-108.20)    1.88                10
 04/28/2017   07:47:09   (  70.04,  59.32) 04/28/2017   07:48:16  (  70.06,  59.27)    2.87                67
 04/30/2017   22:24:40   (  70.20,-159.85) 04/30/2017   22:23:45  (  70.23,-159.85)    3.39                55
 04/30/2017   23:14:10   ( -70.09,   7.63) 04/30/2017   23:14:27  ( -70.13,   7.63)    3.56                17
 05/01/2017   00:03:50   (  69.26, 174.14) 05/01/2017   00:04:57  (  69.28, 176.18)   80.35                67
 05/03/2017   14:41:07   (  70.19, -43.99) 05/03/2017   14:40:40  (  70.19, -44.03)    1.67                27
 05/03/2017   15:30:37   ( -70.09, 123.50) 05/03/2017   15:31:22  ( -70.09, 123.45)    1.93                45