Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 28.  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)
 05/30/2023   15:17:46   ( -70.11, 126.61) 05/30/2023   15:18:30  ( -70.11, 126.60)    0.99                44
 05/30/2023   16:08:30   (  69.99, -65.90) 05/30/2023   16:07:57  (  70.00, -65.90)    1.22                33
 06/02/2023   06:44:10   (  70.81,  73.95) 06/02/2023   06:45:18  (  70.75,  75.78)   67.56                68
 06/02/2023   07:34:40   ( -70.09,-117.59) 06/02/2023   07:34:58  ( -70.09,-117.55)    1.75                18
 06/02/2023   08:25:24   (  69.97,  49.89) 06/02/2023   08:24:25  (  69.98,  49.95)    2.34                59
 06/04/2023   23:00:53   (  70.17,-169.26) 06/04/2023   23:01:57  (  70.16,-169.20)    2.09                64
 06/04/2023   23:51:34   ( -70.02,  -1.72) 06/04/2023   23:51:28  ( -70.00,  -1.80)    3.55                 6
 06/05/2023   00:42:11   (  69.53, 166.31) 06/05/2023   00:41:00  (  69.62, 165.31)   39.66                71
 06/07/2023   15:17:47   (  70.11, -53.40) 06/07/2023   15:18:26  (  70.11, -53.41)    0.44                39
 06/07/2023   16:08:29   ( -70.01, 114.06) 06/07/2023   16:07:56  ( -70.01, 114.08)    0.89                33
 06/10/2023   06:44:09   ( -70.79,-106.02) 06/10/2023   06:45:18  ( -70.70,-104.31)   63.42                69
 06/10/2023   07:34:42   (  70.10,  62.37) 06/10/2023   07:34:54  (  70.09,  62.44)    3.19                12
 06/10/2023   08:25:23   ( -69.95,-130.08) 06/10/2023   08:24:25  ( -69.93,-130.14)    3.13                58