Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 18.  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   09:38:08   (  71.10,  30.43) 12/20/2022   09:39:14  (  70.96,  32.94)   92.21                66
 12/20/2022   10:28:24   ( -70.11,-160.62) 12/20/2022   10:28:57  ( -70.13,-160.66)    3.14                33
 12/20/2022   11:19:08   (  70.04,   6.80) 12/20/2022   11:18:24  (  70.03,   6.84)    1.66                44
 12/23/2022   06:01:54   ( -70.37, -94.37) 12/23/2022   06:03:05  ( -70.32, -93.94)   16.89                71
 12/23/2022   06:52:34   (  70.11,  73.34) 12/23/2022   06:52:34  (  70.10,  73.39)    2.16                 0
 12/23/2022   07:43:07   ( -69.99,-119.13) 12/23/2022   07:42:04  ( -69.99,-119.13)    0.42                63
 12/26/2022   02:26:00   (  70.15, 139.93) 12/26/2022   02:26:45  (  70.15, 139.91)    0.64                45
 12/26/2022   03:16:34   ( -70.05, -52.57) 12/26/2022   03:16:15  ( -70.04, -52.61)    1.59                19
 12/26/2022   04:07:02   (  69.18, 116.01) 12/26/2022   04:05:55  (  69.21, 113.91)   83.09                67
 12/28/2022   21:59:38   (  70.84,-154.53) 12/28/2022   22:00:46  (  70.73,-152.79)   64.87                68
 12/28/2022   22:50:01   ( -70.13,  13.95) 12/28/2022   22:50:25  ( -70.13,  13.96)    0.40                24
 12/28/2022   23:40:42   (  69.99,-178.51) 12/28/2022   23:39:52  (  70.01,-178.56)    3.19                50
 12/31/2022   18:23:26   ( -70.17,  80.54) 12/31/2022   18:24:34  ( -70.19,  80.51)    2.61                68
 12/31/2022   19:14:07   (  70.07,-111.98) 12/31/2022   19:14:01  (  70.07,-112.02)    1.53                 6
 12/31/2022   20:04:42   ( -69.95,  55.53) 12/31/2022   20:03:31  ( -69.97,  55.47)    3.16                71