Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 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)
 10/18/2023   23:50:55   (  70.69, 177.27) 10/18/2023   23:52:03  (  70.61, 179.20)   71.58                68
 10/19/2023   00:41:24   ( -69.92, -14.20) 10/19/2023   00:41:44  ( -69.90, -14.20)    2.53                20
 10/19/2023   01:32:08   (  69.80, 153.28) 10/19/2023   01:31:11  (  69.79, 153.30)    1.25                57
 10/21/2023   16:07:33   (  69.99, -65.84) 10/21/2023   16:08:42  (  70.01, -65.79)    2.90                69
 10/21/2023   16:58:15   ( -69.90, 101.61) 10/21/2023   16:58:12  ( -69.90, 101.68)    2.74                 3
 10/21/2023   17:48:55   (  69.57, -90.60) 10/21/2023   17:47:42  (  69.63, -91.05)   18.20                73
 10/24/2023   08:24:24   (  69.93,  50.02) 10/24/2023   08:25:12  (  69.91,  49.96)    3.50                48
 10/24/2023   09:15:06   ( -69.84,-142.52) 10/24/2023   09:14:41  ( -69.86,-142.48)    2.62                25
 10/27/2023   00:41:15   (  69.89, 165.87) 10/27/2023   00:41:40  (  69.88, 165.80)    2.65                25
 10/27/2023   01:31:57   ( -69.79, -26.67) 10/27/2023   01:31:10  ( -69.78, -26.71)    2.34                47
 10/29/2023   16:07:26   ( -70.17, 113.92) 10/29/2023   16:08:38  ( -70.09, 114.35)   18.42                72
 10/29/2023   16:58:06   (  69.87, -78.30) 10/29/2023   16:58:07  (  69.87, -78.32)    0.94                 1
 10/29/2023   17:48:48   ( -69.76,  89.17) 10/29/2023   17:47:37  ( -69.77,  89.16)    0.36                71
 11/01/2023   08:24:12   ( -69.95,-129.95) 11/01/2023   08:25:06  ( -69.93,-129.99)    2.34                54
 11/01/2023   09:14:56   (  69.85,  37.50) 11/01/2023   09:14:32  (  69.87,  37.57)    3.12                24