Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 10 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)
 10/13/2023   16:07:40   ( -69.99, 114.13) 10/13/2023   16:08:42  ( -70.00, 114.19)    2.10                62
 10/13/2023   16:58:24   (  69.87, -78.38) 10/13/2023   16:58:09  (  69.89, -78.31)    3.41                15
 10/13/2023   17:48:57   ( -69.31,  89.75) 10/13/2023   17:47:46  ( -69.40,  88.64)   44.38                71
 10/16/2023   08:24:32   ( -69.95,-130.02) 10/16/2023   08:25:13  ( -69.97,-129.98)    2.99                41
 10/16/2023   09:15:16   (  69.83,  37.46) 10/16/2023   09:14:41  (  69.81,  37.44)    2.81                35
 10/18/2023   23:50:55   (  70.70, 177.27) 10/18/2023   23:52:03  (  70.60, 179.19)   71.54                68
 10/19/2023   00:41:24   ( -69.92, -14.20) 10/19/2023   00:41:44  ( -69.89, -14.20)    2.90                20
 10/19/2023   01:32:08   (  69.81, 153.28) 10/19/2023   01:31:11  (  69.78, 153.29)    2.91                57
 10/21/2023   16:07:33   (  70.00, -65.86) 10/21/2023   16:08:42  (  69.98, -65.83)    2.77                69
 10/21/2023   16:58:14   ( -69.85, 101.69) 10/21/2023   16:58:12  ( -69.87, 101.65)    2.72                 2
 10/21/2023   17:48:54   (  69.53, -90.54) 10/21/2023   17:47:42  (  69.59, -91.08)   22.30                72
 10/24/2023   08:24:24   (  69.95,  50.00) 10/24/2023   08:25:10  (  69.96,  50.03)    1.40                46
 10/24/2023   09:15:06   ( -69.85,-142.53) 10/24/2023   09:14:40  ( -69.86,-142.48)    2.10                26