Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 5.  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)
 01/06/2023   14:28:38   (  71.13, -42.30) 01/06/2023   14:29:43  (  71.05, -39.55)   99.63                65
 01/06/2023   15:19:02   ( -70.09, 126.68) 01/06/2023   15:19:28  ( -70.12, 126.69)    2.98                26
 01/06/2023   16:09:46   (  69.97, -65.83) 01/06/2023   16:08:56  (  69.96, -65.89)    2.87                50
 01/09/2023   06:45:16   (  70.25,  74.89) 01/09/2023   06:46:27  (  70.20,  75.06)    7.83                71
 01/09/2023   07:35:56   ( -70.05,-117.49) 01/09/2023   07:35:58  ( -70.04,-117.53)    1.87                 2
 01/09/2023   08:26:38   (  69.83,  50.15) 01/09/2023   08:25:26  (  69.88,  49.88)   11.83                72
 01/11/2023   23:02:07   (  70.11,-169.13) 01/11/2023   23:02:56  (  70.10,-169.20)    2.78                49
 01/11/2023   23:52:49   ( -70.01,  -1.67) 01/11/2023   23:52:26  ( -70.00,  -1.71)    2.35                23
 01/14/2023   15:19:01   (  70.08, -53.32) 01/14/2023   15:19:24  (  70.09, -53.34)    1.13                23
 01/14/2023   16:09:43   ( -69.98, 114.14) 01/14/2023   16:08:54  ( -69.99, 114.15)    0.53                49
 01/17/2023   06:45:13   ( -70.27,-105.16) 01/17/2023   06:46:24  ( -70.22,-104.90)   10.85                71
 01/17/2023   07:35:55   (  70.06,  62.48) 01/17/2023   07:35:52  (  70.05,  62.50)    1.22                 3
 01/17/2023   08:26:36   ( -69.91,-129.98) 01/17/2023   08:25:23  ( -69.90,-130.09)    4.39                73