Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2017 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)
 04/22/2017   22:24:48   ( -70.20,  20.15) 04/22/2017   22:23:43  ( -70.23,  20.15)    3.34                65
 04/22/2017   23:14:15   (  70.10,-172.35) 04/22/2017   23:14:27  (  70.13,-172.37)    3.18                12
 04/23/2017   00:03:51   ( -69.66,  -5.33) 04/23/2017   00:05:02  ( -69.66,  -4.35)   37.93                71
 04/25/2017   14:41:14   ( -70.22, 136.05) 04/25/2017   14:40:37  ( -70.19, 135.99)    3.48                37
 04/25/2017   15:30:42   (  70.05, -56.54) 04/25/2017   15:31:20  (  70.04, -56.46)    3.57                38
 04/28/2017   06:08:07   (  70.55,  84.78) 04/28/2017   06:06:56  (  70.57,  83.84)   34.94                71
 04/28/2017   06:57:42   ( -70.17,-108.14) 04/28/2017   06:57:32  ( -70.15,-108.18)    2.26                10
 04/28/2017   07:47:09   (  70.06,  59.34) 04/28/2017   07:48:16  (  70.05,  59.28)    2.43                67
 04/30/2017   22:24:40   (  70.22,-159.82) 04/30/2017   22:23:45  (  70.22,-159.84)    0.64                55
 04/30/2017   23:14:10   ( -70.11,   7.66) 04/30/2017   23:14:27  ( -70.12,   7.64)    0.84                17
 05/01/2017   00:03:50   (  69.28, 174.17) 05/01/2017   00:04:57  (  69.27, 176.19)   79.69                67
 05/03/2017   14:41:07   (  70.21, -43.95) 05/03/2017   14:40:40  (  70.19, -44.02)    3.52                27
 05/03/2017   15:30:38   ( -70.06, 123.46) 05/03/2017   15:31:22  ( -70.08, 123.46)    3.11                44