Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 19.  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)
 12/20/2022   09:38:07   (  71.06,  30.49) 12/20/2022   09:39:13  (  71.00,  33.01)   91.02                66
 12/20/2022   10:28:24   ( -70.12,-160.64) 12/20/2022   10:28:57  ( -70.12,-160.68)    1.47                33
 12/20/2022   11:19:07   (  70.00,   6.86) 12/20/2022   11:18:24  (  70.02,   6.82)    2.62                43
 12/23/2022   06:01:54   ( -70.38, -94.39) 12/23/2022   06:03:05  ( -70.30, -93.97)   18.08                71
 12/23/2022   06:52:33   (  70.07,  73.40) 12/23/2022   06:52:34  (  70.09,  73.37)    2.13                 1
 12/23/2022   07:43:07   ( -70.00,-119.15) 12/23/2022   07:42:04  ( -69.97,-119.16)    3.07                63
 12/26/2022   02:26:00   (  70.16, 139.91) 12/26/2022   02:26:45  (  70.13, 139.89)    3.25                45
 12/26/2022   03:16:34   ( -70.06, -52.59) 12/26/2022   03:16:14  ( -70.08, -52.56)    2.29                20
 12/26/2022   04:07:02   (  69.19, 115.99) 12/26/2022   04:05:54  (  69.25, 113.96)   80.42                68
 12/28/2022   21:59:37   (  70.80,-154.46) 12/28/2022   22:00:46  (  70.71,-152.82)   61.19                69
 12/28/2022   22:50:00   ( -70.09,  14.01) 12/28/2022   22:50:25  ( -70.11,  13.94)    3.65                25
 12/28/2022   23:40:42   (  70.00,-178.53) 12/28/2022   23:39:52  (  69.99,-178.58)    2.01                50
 12/31/2022   18:23:26   ( -70.19,  80.51) 12/31/2022   18:24:34  ( -70.17,  80.48)    2.07                68
 12/31/2022   19:14:07   (  70.08,-112.00) 12/31/2022   19:14:00  (  70.11,-111.97)    3.40                 7
 12/31/2022   20:04:42   ( -69.97,  55.51) 12/31/2022   20:03:31  ( -69.95,  55.44)    3.19                71