Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 30.  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)
 01/01/2023   06:45:16   ( -70.29,-105.15) 01/01/2023   06:46:27  ( -70.27,-104.84)   11.69                71
 01/01/2023   07:35:58   (  70.07,  62.50) 01/01/2023   07:35:56  (  70.06,  62.50)    1.25                 2
 01/01/2023   08:26:39   ( -69.93,-129.97) 01/01/2023   08:25:26  ( -69.95,-130.02)    3.25                73
 01/03/2023   23:02:08   ( -70.13,  10.87) 01/03/2023   23:02:59  ( -70.14,  10.84)    1.47                51
 01/03/2023   23:52:52   (  70.01, 178.35) 01/03/2023   23:52:26  (  70.03, 178.33)    1.80                26
 01/04/2023   00:43:18   ( -69.07, -12.98) 01/04/2023   00:42:11  ( -69.10, -15.29)   91.90                67
 01/06/2023   14:28:38   (  71.12, -42.28) 01/06/2023   14:29:44  (  71.02, -39.60)   97.60                66
 01/06/2023   15:19:02   ( -70.08, 126.71) 01/06/2023   15:19:29  ( -70.09, 126.66)    2.57                27
 01/06/2023   16:09:46   (  69.97, -65.82) 01/06/2023   16:08:56  (  69.98, -65.86)    2.22                50
 01/09/2023   06:45:15   (  70.24,  74.91) 01/09/2023   06:46:26  (  70.24,  75.11)    7.53                71
 01/09/2023   07:35:56   ( -70.09,-117.54) 01/09/2023   07:35:57  ( -70.08,-117.48)    2.51                 1
 01/09/2023   08:26:38   (  69.87,  50.09) 01/09/2023   08:25:25  (  69.91,  49.93)    7.56                73
 01/11/2023   23:02:08   (  70.15,-169.19) 01/11/2023   23:02:56  (  70.15,-169.14)    2.10                48
 01/11/2023   23:52:49   ( -70.00,  -1.64) 01/11/2023   23:52:27  ( -69.99,  -1.72)    2.93                22