Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 13.  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   (  70.09, -53.34) 01/14/2023   15:19:23  (  70.09, -53.33)    0.53                22
 01/14/2023   16:09:42   ( -69.95, 114.19) 01/14/2023   16:08:53  ( -69.98, 114.14)    3.24                49
 01/17/2023   06:45:11   ( -70.20,-105.05) 01/17/2023   06:46:23  ( -70.18,-104.96)    3.89                72
 01/17/2023   07:35:54   (  70.03,  62.52) 01/17/2023   07:35:51  (  70.01,  62.45)    3.32                 3
 01/17/2023   08:26:34   ( -69.84,-129.87) 01/17/2023   08:25:22  ( -69.85,-130.15)   10.62                72
 01/19/2023   23:02:04   ( -70.15,  10.80) 01/19/2023   23:02:50  ( -70.13,  10.86)    2.83                46
 01/19/2023   23:52:48   (  70.04, 178.28) 01/19/2023   23:52:17  (  70.02, 178.34)    3.23                31
 01/22/2023   14:28:27   (  70.89, -41.92) 01/22/2023   14:29:35  (  70.75, -39.96)   73.13                68
 01/22/2023   15:18:56   ( -70.11, 126.64) 01/22/2023   15:19:15  ( -70.10, 126.71)    2.87                19
 01/22/2023   16:09:39   (  69.94, -65.81) 01/22/2023   16:08:43  (  69.93, -65.89)    3.29                56
 01/25/2023   06:45:06   (  70.12,  75.07) 01/25/2023   06:46:11  (  70.14,  75.03)    2.76                65
 01/25/2023   07:35:48   ( -70.02,-117.47) 01/25/2023   07:35:41  ( -70.04,-117.48)    2.03                 7
 01/25/2023   08:26:25   (  69.54,  50.55) 01/25/2023   08:25:14  (  69.59,  49.54)   39.38                71