Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 14.  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)
 01/14/2023   15:19:01   (  70.08, -53.33) 01/14/2023   15:19:23  (  70.10, -53.32)    1.76                22
 01/14/2023   16:09:43   ( -70.00, 114.12) 01/14/2023   16:08:53  ( -69.99, 114.15)    1.82                50
 01/17/2023   06:45:11   ( -70.19,-105.04) 01/17/2023   06:46:23  ( -70.18,-104.96)    3.19                72
 01/17/2023   07:35:54   (  70.02,  62.53) 01/17/2023   07:35:51  (  70.02,  62.45)    2.98                 3
 01/17/2023   08:26:34   ( -69.83,-129.86) 01/17/2023   08:25:22  ( -69.85,-130.14)   11.04                72
 01/19/2023   23:02:03   ( -70.14,  10.81) 01/19/2023   23:02:49  ( -70.12,  10.85)    2.68                46
 01/19/2023   23:52:47   (  70.03, 178.29) 01/19/2023   23:52:16  (  70.01, 178.34)    2.82                31
 01/22/2023   14:28:27   (  70.88, -41.92) 01/22/2023   14:29:34  (  70.79, -39.90)   74.36                67
 01/22/2023   15:18:56   ( -70.11, 126.64) 01/22/2023   15:19:15  ( -70.08, 126.69)    3.06                19
 01/22/2023   16:09:39   (  69.94, -65.81) 01/22/2023   16:08:42  (  69.97, -65.83)    2.94                57
 01/25/2023   06:45:06   (  70.12,  75.06) 01/25/2023   06:46:11  (  70.11,  74.99)    3.01                65
 01/25/2023   07:35:48   ( -70.03,-117.47) 01/25/2023   07:35:41  ( -70.01,-117.52)    2.80                 7
 01/25/2023   08:26:24   (  69.49,  50.62) 01/25/2023   08:25:14  (  69.56,  49.50)   44.10                70
 01/27/2023   23:01:59   (  70.11,-169.15) 01/27/2023   23:02:35  (  70.11,-169.12)    1.26                36
 01/27/2023   23:52:41   ( -70.01,  -1.68) 01/27/2023   23:52:05  ( -70.01,  -1.63)    2.09                36