Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 27.  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)
 06/27/2023   14:52:32   ( -70.87, 131.72) 06/27/2023   14:53:39  ( -70.76, 133.88)   79.85                67
 06/27/2023   15:43:02   (  70.03, -59.62) 06/27/2023   15:43:18  (  70.01, -59.58)    2.69                16
 06/27/2023   16:33:43   ( -69.88, 107.91) 06/27/2023   16:32:48  ( -69.89, 107.89)    1.21                55
 06/30/2023   07:09:10   ( -70.10,-111.26) 06/30/2023   07:10:22  ( -70.08,-111.25)    1.95                72
 06/30/2023   07:59:54   (  69.99,  56.21) 06/30/2023   07:59:49  (  69.98,  56.25)    1.81                 5
 06/30/2023   08:50:33   ( -69.73,-136.09) 06/30/2023   08:49:21  ( -69.76,-136.42)   12.81                72
 07/02/2023   23:26:03   ( -70.06,   4.56) 07/02/2023   23:26:53  ( -70.08,   4.63)    3.59                50
 07/03/2023   00:16:46   (  69.90, 172.11) 07/03/2023   00:16:21  (  69.92, 172.05)    3.31                25
 07/03/2023   01:07:12   ( -68.95, -19.22) 07/03/2023   01:06:05  ( -69.04, -21.50)   91.40                67
 07/05/2023   15:42:56   ( -70.03, 120.38) 07/05/2023   15:43:25  ( -70.00, 120.40)    3.27                29
 07/05/2023   16:33:39   (  69.88, -72.08) 07/05/2023   16:32:52  (  69.89, -72.11)    2.22                47
 07/08/2023   07:09:11   (  70.33,  68.38) 07/08/2023   07:10:23  (  70.22,  68.96)   24.95                72
 07/08/2023   07:59:48   ( -69.96,-123.74) 07/08/2023   07:59:56  ( -69.95,-123.79)    2.10                 8
 07/08/2023   08:50:32   (  69.86,  43.72) 07/08/2023   08:49:23  (  69.84,  43.70)    2.53                69
 07/10/2023   23:25:58   (  70.06,-175.43) 07/10/2023   23:26:55  (  70.03,-175.43)    3.08                57
 07/11/2023   00:16:40   ( -69.95,  -7.95) 07/11/2023   00:16:25  ( -69.93,  -7.94)    2.15                15
 07/11/2023   01:07:11   (  69.17, 160.50) 07/11/2023   01:06:03  (  69.21, 158.73)   70.26                68