Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 29.  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)
 12/29/2022   15:19:04   (  70.10, -53.32) 12/29/2022   15:19:26  (  70.09, -53.33)    1.84                22
 12/29/2022   16:09:45   ( -69.97, 114.21) 12/29/2022   16:08:56  ( -69.98, 114.15)    2.92                49
 01/01/2023   06:45:16   ( -70.26,-105.11) 01/01/2023   06:46:28  ( -70.24,-104.88)    8.83                72
 01/01/2023   07:35:59   (  70.10,  62.46) 01/01/2023   07:35:56  (  70.08,  62.53)    3.08                 3
 01/01/2023   08:26:40   ( -69.95,-130.01) 01/01/2023   08:25:26  ( -69.98,-129.98)    2.68                74
 01/03/2023   23:02:08   ( -70.15,  10.83) 01/03/2023   23:02:58  ( -70.17,  10.89)    2.75                50
 01/03/2023   23:52:52   (  70.04, 178.31) 01/03/2023   23:52:25  (  70.06, 178.37)    3.11                27
 01/04/2023   00:43:17   ( -69.05, -12.94) 01/04/2023   00:42:10  ( -69.13, -15.25)   92.30                67
 01/06/2023   15:19:02   ( -70.10, 126.67) 01/06/2023   15:19:28  ( -70.12, 126.70)    3.00                26
 01/06/2023   16:09:46   (  69.99, -65.85) 01/06/2023   16:08:55  (  70.01, -65.81)    2.76                51
 01/09/2023   06:45:16   (  70.26,  74.88) 01/09/2023   06:46:27  (  70.21,  75.08)    8.87                71
 01/09/2023   07:35:56   ( -70.05,-117.49) 01/09/2023   07:35:58  ( -70.06,-117.51)    1.06                 2
 01/09/2023   08:26:39   (  69.89,  50.06) 01/09/2023   08:25:26  (  69.89,  49.90)    6.23                73
 01/11/2023   23:02:08   (  70.11,-169.14) 01/11/2023   23:02:57  (  70.13,-169.16)    2.06                49
 01/11/2023   23:52:50   ( -70.01,  -1.67) 01/11/2023   23:52:27  ( -70.03,  -1.67)    2.19                23