Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 23.  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)
 01/25/2023   06:45:10   (  70.35,  74.71) 01/25/2023   06:46:21  (  70.27,  75.15)   19.27                71
 01/25/2023   07:35:48   ( -70.05,-117.51) 01/25/2023   07:35:53  ( -70.04,-117.53)    1.28                 5
 01/25/2023   08:26:32   (  69.94,  49.97) 01/25/2023   08:25:20  (  69.94,  49.97)    0.58                72
 01/27/2023   23:01:59   (  70.13,-169.18) 01/27/2023   23:02:54  (  70.15,-169.14)    2.77                55
 01/27/2023   23:52:41   ( -70.04,  -1.73) 01/27/2023   23:52:24  ( -70.05,  -1.66)    2.54                17
 01/28/2023   00:43:11   (  69.19, 166.83) 01/28/2023   00:42:03  (  69.28, 164.94)   75.25                68
 01/30/2023   15:18:51   (  70.09, -53.34) 01/30/2023   15:19:25  (  70.10, -53.35)    0.99                34
 01/30/2023   16:09:33   ( -69.99, 114.12) 01/30/2023   16:08:55  ( -69.99, 114.13)    0.73                38
 02/02/2023   06:45:09   ( -70.73,-105.90) 02/02/2023   06:46:18  ( -70.64,-104.33)   58.76                69
 02/02/2023   07:35:42   (  70.05,  62.49) 02/02/2023   07:35:54  (  70.03,  62.44)    2.83                12
 02/02/2023   08:26:24   ( -69.96,-130.05) 02/02/2023   08:25:24  ( -69.93,-130.07)    3.22                60
 02/04/2023   23:01:50   ( -70.13,  10.83) 02/04/2023   23:02:55  ( -70.14,  10.82)    0.57                65
 02/04/2023   23:52:34   (  70.03, 178.30) 02/04/2023   23:52:22  (  70.02, 178.31)    0.90                12
 02/05/2023   00:43:09   ( -69.56, -13.69) 02/05/2023   00:41:58  ( -69.59, -14.66)   37.64                71