Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 6.  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   (  71.12, -42.30) 01/06/2023   14:29:43  (  71.05, -39.55)   99.64                65
 01/06/2023   15:19:02   ( -70.09, 126.68) 01/06/2023   15:19:28  ( -70.12, 126.69)    2.85                26
 01/06/2023   16:09:46   (  69.97, -65.83) 01/06/2023   16:08:56  (  69.96, -65.89)    2.83                50
 01/09/2023   06:45:16   (  70.25,  74.89) 01/09/2023   06:46:27  (  70.20,  75.06)    8.01                71
 01/09/2023   07:35:56   ( -70.05,-117.49) 01/09/2023   07:35:58  ( -70.04,-117.53)    1.86                 2
 01/09/2023   08:26:38   (  69.83,  50.15) 01/09/2023   08:25:26  (  69.88,  49.88)   11.65                72
 01/11/2023   23:02:07   (  70.11,-169.13) 01/11/2023   23:02:56  (  70.10,-169.20)    2.63                49
 01/11/2023   23:52:49   ( -70.02,  -1.68) 01/11/2023   23:52:26  ( -70.00,  -1.71)    2.62                23
 01/14/2023   15:19:01   (  70.09, -53.33) 01/14/2023   15:19:24  (  70.09, -53.34)    0.20                23
 01/14/2023   16:09:43   ( -69.99, 114.13) 01/14/2023   16:08:54  ( -69.99, 114.15)    1.18                49
 01/17/2023   06:45:13   ( -70.28,-105.18) 01/17/2023   06:46:24  ( -70.22,-104.90)   12.27                71
 01/17/2023   07:35:55   (  70.07,  62.46) 01/17/2023   07:35:52  (  70.05,  62.50)    2.70                 3
 01/17/2023   08:26:36   ( -69.92,-130.00) 01/17/2023   08:25:22  ( -69.95,-130.01)    3.33                74
 01/19/2023   23:02:04   ( -70.11,  10.85) 01/19/2023   23:02:53  ( -70.11,  10.82)    1.15                49
 01/19/2023   23:52:48   (  70.01, 178.32) 01/19/2023   23:52:20  (  69.99, 178.30)    2.31                28