Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 1 8.  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)
 01/09/2023   06:45:15   (  70.21,  74.95) 01/09/2023   06:46:27  (  70.18,  75.03)    4.10                72
 01/09/2023   07:35:56   ( -70.07,-117.52) 01/09/2023   07:35:57  ( -70.07,-117.50)    0.79                 1
 01/09/2023   08:26:38   (  69.84,  50.13) 01/09/2023   08:25:25  (  69.91,  49.92)   10.82                73
 01/11/2023   23:02:08   (  70.12,-169.15) 01/11/2023   23:02:56  (  70.12,-169.18)    0.91                48
 01/11/2023   23:52:50   ( -70.04,  -1.70) 01/11/2023   23:52:26  ( -70.01,  -1.70)    2.69                24
 01/14/2023   15:19:01   (  70.10, -53.35) 01/14/2023   15:19:23  (  70.09, -53.34)    1.77                22
 01/14/2023   16:09:42   ( -69.96, 114.18) 01/14/2023   16:08:53  ( -69.98, 114.15)    2.92                49
 01/17/2023   06:45:11   ( -70.20,-105.04) 01/17/2023   06:46:23  ( -70.19,-104.94)    3.80                72
 01/17/2023   07:35:54   (  70.03,  62.52) 01/17/2023   07:35:51  (  70.03,  62.46)    2.23                 3
 01/17/2023   08:26:35   ( -69.89,-129.95) 01/17/2023   08:25:21  ( -69.92,-130.05)    5.51                74
 01/19/2023   23:02:04   ( -70.13,  10.82) 01/19/2023   23:02:51  ( -70.11,  10.83)    2.82                47
 01/19/2023   23:52:47   (  69.97, 178.37) 01/19/2023   23:52:18  (  69.99, 178.30)    3.27                29
 01/22/2023   14:28:29   (  70.91, -41.98) 01/22/2023   14:29:36  (  70.81, -39.88)   77.18                67
 01/22/2023   15:18:57   ( -70.08, 126.67) 01/22/2023   15:19:17  ( -70.10, 126.71)    3.09                20
 01/22/2023   16:09:41   (  69.97, -65.86) 01/22/2023   16:08:44  (  69.98, -65.81)    2.04                57