Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 12.  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)
 08/13/2023   07:33:59   (  70.47,  61.92) 08/13/2023   07:35:09  (  70.40,  63.06)   43.07                70
 08/13/2023   08:24:33   ( -69.96,-129.97) 08/13/2023   08:24:45  ( -69.95,-129.95)    1.54                12
 08/13/2023   09:15:17   (  69.85,  37.51) 08/13/2023   09:14:12  (  69.86,  37.56)    2.02                65
 08/15/2023   23:50:42   (  70.03, 178.39) 08/15/2023   23:51:45  (  70.00, 178.37)    3.18                63
 08/16/2023   00:41:24   ( -69.94, -14.15) 08/16/2023   00:41:14  ( -69.94, -14.08)    2.64                10
 08/16/2023   01:31:59   (  69.35, 154.02) 08/16/2023   01:30:49  (  69.40, 152.82)   47.29                70
 08/18/2023   16:07:33   (  70.01, -65.80) 08/18/2023   16:08:13  (  70.02, -65.72)    2.93                40
 08/18/2023   16:58:14   ( -69.87, 101.73) 08/18/2023   16:57:44  ( -69.85, 101.68)    3.28                30
 08/21/2023   07:33:54   ( -70.90,-118.73) 08/21/2023   07:35:01  ( -70.77,-116.37)   87.34                67
 08/21/2023   08:24:22   (  69.95,  50.08) 08/21/2023   08:24:41  (  69.95,  50.08)    0.19                19
 08/21/2023   09:15:04   ( -69.86,-142.47) 08/21/2023   09:14:11  ( -69.84,-142.44)    2.16                53
 08/23/2023   23:50:30   ( -70.11,  -1.68) 08/23/2023   23:51:41  ( -70.08,  -1.49)    7.82                71
 08/24/2023   00:41:12   (  69.90, 165.94) 08/24/2023   00:41:09  (  69.92, 165.92)    2.25                 3
 08/24/2023   01:31:53   ( -69.75, -26.52) 08/24/2023   01:30:40  ( -69.76, -26.67)    5.88                73
 08/26/2023   16:07:19   ( -70.01, 114.26) 08/26/2023   16:08:09  ( -70.03, 114.32)    3.41                50
 08/26/2023   16:58:02   (  69.85, -78.20) 08/26/2023   16:57:37  (  69.86, -78.27)    2.91                25