Simultaneous Nadir Overpasses (SNOs) between LANDSAT-8 and NPP
TLE Epoch: 2021 7 9.  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)
 07/09/2021   14:41:50   ( -70.12, 136.03) 07/09/2021   14:40:58  ( -70.11, 135.99)    1.78                52
 07/09/2021   15:31:18   (  69.96, -56.54) 07/09/2021   15:31:42  (  69.99, -56.51)    2.61                24
 07/09/2021   16:21:02   ( -69.08, 109.89) 07/09/2021   16:22:08  ( -69.05, 112.16)   89.91                66
 07/12/2021   06:08:36   (  70.95,  85.53) 07/12/2021   06:07:29  (  71.02,  82.96)   93.18                67
 07/12/2021   06:58:20   ( -70.08,-108.15) 07/12/2021   06:57:55  ( -70.10,-108.22)    3.58                25
 07/12/2021   07:47:48   (  69.92,  59.27) 07/12/2021   07:48:38  (  69.92,  59.35)    2.91                50
 07/14/2021   22:25:19   (  70.14,-159.81) 07/14/2021   22:24:08  (  70.12,-159.82)    1.84                71
 07/14/2021   23:14:49   ( -70.03,   7.67) 07/14/2021   23:14:50  ( -70.03,   7.64)    1.17                 1
 07/15/2021   00:04:19   (  69.76, 174.93) 07/15/2021   00:05:31  (  69.75, 175.37)   16.64                72
 07/17/2021   14:41:49   (  70.08, -44.00) 07/17/2021   14:41:04  (  70.06, -43.96)    2.95                45
 07/17/2021   15:31:19   ( -69.98, 123.48) 07/17/2021   15:31:46  ( -69.97, 123.50)    1.20                27
 07/20/2021   06:08:39   ( -70.85, -94.63) 07/20/2021   06:07:31  ( -70.90, -96.85)   80.91                68
 07/20/2021   06:58:18   (  70.08,  71.87) 07/20/2021   06:58:01  (  70.06,  71.82)    3.34                17
 07/20/2021   07:47:49   ( -69.92,-120.71) 07/20/2021   07:48:42  ( -69.91,-120.65)    2.93                53
 07/22/2021   22:25:21   ( -70.13,  20.19) 07/22/2021   22:24:13  ( -70.11,  20.19)    2.26                68
 07/22/2021   23:14:48   (  70.02,-172.33) 07/22/2021   23:14:57  (  70.00,-172.33)    1.63                 9
 07/23/2021   00:04:23   ( -69.64,  -5.21) 07/23/2021   00:05:34  ( -69.64,  -4.48)   28.37                71