Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 17.  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)
 12/17/2022   14:04:25   (  70.19, -34.74) 12/17/2022   14:05:16  (  70.17, -34.68)    3.04                51
 12/17/2022   14:54:57   ( -70.06, 132.81) 12/17/2022   14:54:46  ( -70.06, 132.79)    1.06                11
 12/17/2022   15:45:31   (  69.44, -58.96) 12/17/2022   15:44:21  (  69.51, -60.32)   53.69                70
 12/20/2022   09:38:07   (  71.09,  30.46) 12/20/2022   09:39:13  (  70.98,  32.97)   91.68                66
 12/20/2022   10:28:24   ( -70.15,-160.68) 12/20/2022   10:28:56  ( -70.15,-160.63)    1.97                32
 12/20/2022   11:19:07   (  70.02,   6.83) 12/20/2022   11:18:23  (  70.05,   6.87)    3.35                44
 12/23/2022   06:01:54   ( -70.35, -94.35) 12/23/2022   06:03:06  ( -70.28, -93.99)   15.16                72
 12/23/2022   06:52:34   (  70.09,  73.36) 12/23/2022   06:52:35  (  70.06,  73.34)    3.36                 1
 12/23/2022   07:43:08   ( -70.03,-119.18) 12/23/2022   07:42:04  ( -70.01,-119.11)    3.30                64
 12/26/2022   02:26:01   (  70.19, 139.87) 12/26/2022   02:26:45  (  70.17, 139.94)    3.15                44
 12/26/2022   03:16:35   ( -70.09, -52.63) 12/26/2022   03:16:15  ( -70.06, -52.58)    3.24                20
 12/26/2022   04:07:02   (  69.16, 116.03) 12/26/2022   04:05:55  (  69.23, 113.93)   83.19                67
 12/28/2022   21:59:37   (  70.83,-154.50) 12/28/2022   22:00:45  (  70.75,-152.76)   64.38                68
 12/28/2022   22:50:00   ( -70.11,  13.98) 12/28/2022   22:50:25  ( -70.10,  13.92)    3.04                25
 12/28/2022   23:40:42   (  70.03,-178.57) 12/28/2022   23:39:51  (  70.03,-178.53)    1.88                51