Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 29.  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)
 06/30/2023   07:09:11   ( -70.12,-111.30) 06/30/2023   07:10:22  ( -70.11,-111.21)    3.92                71
 06/30/2023   07:59:54   (  69.96,  56.26) 06/30/2023   07:59:50  (  69.95,  56.22)    1.52                 4
 06/30/2023   08:50:34   ( -69.76,-136.13) 06/30/2023   08:49:21  ( -69.78,-136.38)   10.02                73
 07/02/2023   23:26:04   ( -70.08,   4.53) 07/02/2023   23:26:54  ( -70.06,   4.60)    3.51                50
 07/03/2023   00:16:47   (  69.92, 172.09) 07/03/2023   00:16:22  (  69.90, 172.02)    2.99                25
 07/03/2023   01:07:13   ( -68.98, -19.24) 07/03/2023   01:06:06  ( -69.02, -21.52)   90.97                67
 07/05/2023   15:42:55   ( -69.99, 120.44) 07/05/2023   15:43:25  ( -69.99, 120.38)    2.17                30
 07/05/2023   16:33:39   (  69.89, -72.09) 07/05/2023   16:32:52  (  69.88, -72.12)    1.21                47
 07/08/2023   07:09:11   (  70.33,  68.37) 07/08/2023   07:10:23  (  70.22,  68.96)   25.13                72
 07/08/2023   07:59:48   ( -69.97,-123.75) 07/08/2023   07:59:56  ( -69.95,-123.79)    2.26                 8
 07/08/2023   08:50:32   (  69.86,  43.72) 07/08/2023   08:49:23  (  69.84,  43.70)    2.50                69
 07/10/2023   23:25:59   (  70.05,-175.42) 07/10/2023   23:26:56  (  70.05,-175.41)    0.30                57
 07/11/2023   00:16:41   ( -69.94,  -7.94) 07/11/2023   00:16:26  ( -69.95,  -7.92)    0.84                15
 07/11/2023   01:07:12   (  69.15, 160.51) 07/11/2023   01:06:04  (  69.23, 158.75)   70.25                68