Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 11.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2022   22:06:44   ( -70.11,  24.78) 12/11/2022   22:07:25  ( -70.13,  24.73)    2.70                41
 12/11/2022   22:57:29   (  70.04,-167.80) 12/11/2022   22:56:52  (  70.03,-167.77)    2.05                37
 12/11/2022   23:47:44   ( -69.04,   1.00) 12/11/2022   23:46:37  ( -69.09,  -1.41)   95.97                67
 12/14/2022   17:40:21   ( -70.64,  90.60) 12/14/2022   17:41:31  ( -70.55,  91.78)   44.78                70
 12/14/2022   18:30:57   (  70.11,-101.26) 12/14/2022   18:31:04  (  70.12,-101.21)    2.24                 7
 12/14/2022   19:21:29   ( -70.00,  66.27) 12/14/2022   19:20:34  ( -70.00,  66.27)    0.64                55
 12/17/2022   14:04:25   (  70.19, -34.75) 12/17/2022   14:05:16  (  70.18, -34.67)    3.17                51
 12/17/2022   14:54:57   ( -70.07, 132.81) 12/17/2022   14:54:46  ( -70.07, 132.81)    0.80                11
 12/17/2022   15:45:31   (  69.44, -58.96) 12/17/2022   15:44:21  (  69.52, -60.31)   53.27                70
 12/20/2022   09:38:07   (  71.09,  30.45) 12/20/2022   09:39:13  (  70.99,  32.99)   92.36                66
 12/20/2022   10:28:24   ( -70.15,-160.68) 12/20/2022   10:28:57  ( -70.12,-160.68)    3.17                33
 12/20/2022   11:19:07   (  70.02,   6.82) 12/20/2022   11:18:24  (  70.01,   6.81)    1.90                43
 12/23/2022   06:01:55   ( -70.40, -94.43) 12/23/2022   06:03:06  ( -70.31, -93.96)   20.67                71
 12/23/2022   06:52:34   (  70.10,  73.36) 12/23/2022   06:52:35  (  70.08,  73.37)    1.27                 1
 12/23/2022   07:43:07   ( -69.97,-119.10) 12/23/2022   07:42:05  ( -69.98,-119.15)    1.83                62