Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 18.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 08/18/2023   16:07:37   (  69.99, -65.78) 08/18/2023   16:08:14  (  69.96, -65.80)    3.31                37
 08/18/2023   16:58:18   ( -69.85, 101.74) 08/18/2023   16:57:44  ( -69.84, 101.67)    3.12                34
 08/21/2023   07:33:57   ( -70.52,-118.16) 08/21/2023   07:35:07  ( -70.43,-116.88)   48.70                70
 08/21/2023   08:24:32   (  69.93,  50.07) 08/21/2023   08:24:41  (  69.95,  50.07)    1.98                 9
 08/21/2023   09:15:14   ( -69.84,-142.48) 08/21/2023   09:14:11  ( -69.83,-142.46)    1.45                63
 08/23/2023   23:50:44   ( -69.99,  -1.58) 08/23/2023   23:51:42  ( -70.01,  -1.59)    2.12                58
 08/24/2023   00:41:28   (  69.88, 165.91) 08/24/2023   00:41:09  (  69.91, 165.90)    3.41                19
 08/24/2023   01:31:58   ( -69.15, -25.73) 08/24/2023   01:30:49  ( -69.24, -27.36)   65.47                69
 08/26/2023   16:07:40   ( -69.94, 114.26) 08/26/2023   16:08:10  ( -69.95, 114.21)    1.92                30
 08/26/2023   16:58:24   (  69.83, -78.26) 08/26/2023   16:57:37  (  69.84, -78.30)    1.87                47
 08/29/2023   07:33:55   (  70.05,  62.54) 08/29/2023   07:35:07  (  70.01,  62.57)    3.78                72
 08/29/2023   08:24:36   ( -69.90,-129.92) 08/29/2023   08:24:37  ( -69.91,-129.95)    1.51                 1
 08/29/2023   09:15:18   (  69.68,  37.72) 08/29/2023   09:14:05  (  69.74,  37.46)   11.90                73
 08/31/2023   23:50:49   (  69.96, 178.44) 08/31/2023   23:51:33  (  69.95, 178.37)    3.02                44
 09/01/2023   00:41:31   ( -69.87, -14.10) 09/01/2023   00:41:03  ( -69.84, -14.14)    2.68                28