Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 27.  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)
 03/27/2023   15:18:23   ( -70.10, 126.60) 03/27/2023   15:19:01  ( -70.10, 126.65)    1.85                38
 03/27/2023   16:09:07   (  69.99, -65.92) 03/27/2023   16:08:28  (  70.00, -65.86)    2.75                39
 03/30/2023   06:44:40   (  70.62,  74.24) 03/30/2023   06:45:50  (  70.48,  75.45)   47.42                70
 03/30/2023   07:35:13   ( -70.06,-117.56) 03/30/2023   07:35:26  ( -70.04,-117.56)    2.59                13
 03/30/2023   08:25:57   (  69.95,  49.92) 03/30/2023   08:24:53  (  69.93,  49.93)    2.33                64
 04/01/2023   23:01:22   (  70.12,-169.19) 04/01/2023   23:02:20  (  70.14,-169.15)    2.61                58
 04/01/2023   23:52:04   ( -70.03,  -1.73) 04/01/2023   23:51:50  ( -70.03,  -1.67)    2.33                14
 04/02/2023   00:42:36   (  69.28, 166.67) 04/02/2023   00:41:27  (  69.36, 165.06)   63.53                69
 04/04/2023   15:18:12   (  70.06, -53.31) 04/04/2023   15:18:44  (  70.09, -53.33)    2.97                32
 04/04/2023   16:08:54   ( -69.97, 114.15) 04/04/2023   16:08:14  ( -69.98, 114.15)    1.25                40
 04/07/2023   06:44:25   ( -70.48,-105.50) 04/07/2023   06:45:36  ( -70.38,-104.65)   33.55                71
 04/07/2023   07:35:03   (  70.06,  62.46) 04/07/2023   07:35:07  (  70.04,  62.51)    3.32                 4
 04/07/2023   08:25:44   ( -69.91,-129.99) 04/07/2023   08:24:37  ( -69.93,-130.01)    1.90                67
 04/09/2023   23:01:08   ( -70.13,  10.84) 04/09/2023   23:02:01  ( -70.12,  10.88)    2.21                53
 04/09/2023   23:51:51   (  69.98, 178.38) 04/09/2023   23:51:28  (  70.00, 178.36)    2.54                23