Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2022 12 15.  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   14:04:24   (  70.15, -34.68) 12/17/2022   14:05:16  (  70.16, -34.69)    1.66                52
 12/17/2022   14:54:57   ( -70.08, 132.79) 12/17/2022   14:54:46  ( -70.05, 132.78)    2.90                11
 12/17/2022   15:45:31   (  69.45, -58.98) 12/17/2022   15:44:21  (  69.50, -60.33)   53.15                70
 12/20/2022   09:38:07   (  71.10,  30.43) 12/20/2022   09:39:13  (  70.97,  32.96)   92.38                66
 12/20/2022   10:28:24   ( -70.16,-160.69) 12/20/2022   10:28:56  ( -70.15,-160.63)    2.49                32
 12/20/2022   11:19:07   (  70.03,   6.81) 12/20/2022   11:18:23  (  70.04,   6.86)    2.19                44
 12/23/2022   06:01:54   ( -70.36, -94.37) 12/23/2022   06:03:06  ( -70.29, -93.99)   16.42                72
 12/23/2022   06:52:34   (  70.11,  73.34) 12/23/2022   06:52:34  (  70.12,  73.42)    3.10                 0
 12/23/2022   07:43:07   ( -69.98,-119.12) 12/23/2022   07:42:04  ( -70.01,-119.10)    3.15                63
 12/26/2022   02:26:00   (  70.15, 139.93) 12/26/2022   02:26:45  (  70.18, 139.94)    3.44                45
 12/26/2022   03:16:34   ( -70.05, -52.57) 12/26/2022   03:16:15  ( -70.07, -52.57)    2.74                19
 12/26/2022   04:07:02   (  69.18, 116.01) 12/26/2022   04:05:55  (  69.24, 113.94)   82.14                67
 12/28/2022   21:59:37   (  70.84,-154.52) 12/28/2022   22:00:45  (  70.76,-152.74)   65.72                68
 12/28/2022   22:50:00   ( -70.13,  13.96) 12/28/2022   22:50:25  ( -70.11,  13.93)    1.93                25
 12/28/2022   23:40:41   (  69.98,-178.51) 12/28/2022   23:39:52  (  69.99,-178.59)    3.11                49