Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 22.  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)
 05/22/2023   15:17:46   (  70.11, -53.37) 05/22/2023   15:18:30  (  70.12, -53.36)    1.64                44
 05/22/2023   16:08:27   ( -69.98, 114.15) 05/22/2023   16:08:00  ( -70.00, 114.11)    3.30                27
 05/25/2023   06:44:10   ( -70.93,-106.23) 05/25/2023   06:45:17  ( -70.81,-104.10)   78.56                67
 05/25/2023   07:34:40   (  70.07,  62.45) 05/25/2023   07:34:56  (  70.05,  62.43)    2.36                16
 05/25/2023   08:25:21   ( -69.94,-130.03) 05/25/2023   08:24:26  ( -69.94,-130.10)    2.69                55
 05/27/2023   23:00:51   ( -70.16,  10.76) 05/27/2023   23:01:54  ( -70.17,  10.84)    2.77                63
 05/27/2023   23:51:35   (  70.04, 178.26) 05/27/2023   23:51:21  (  70.06, 178.33)    3.28                14
 05/28/2023   00:42:09   ( -69.53, -13.67) 05/28/2023   00:40:58  ( -69.56, -14.72)   40.99                71
 05/30/2023   15:17:45   ( -70.09, 126.65) 05/30/2023   15:18:20  ( -70.09, 126.62)    1.13                35
 05/30/2023   16:08:29   (  69.97, -65.87) 05/30/2023   16:07:47  (  69.98, -65.89)    1.31                42
 06/02/2023   06:44:01   (  70.33,  74.73) 06/02/2023   06:45:13  (  70.26,  75.12)   16.42                72
 06/02/2023   07:34:40   ( -70.07,-117.56) 06/02/2023   07:34:45  ( -70.04,-117.56)    3.50                 5
 06/02/2023   08:25:23   (  69.91,  49.99) 06/02/2023   08:24:12  (  69.93,  49.92)    3.26                71
 06/04/2023   23:00:51   (  70.11,-169.17) 06/04/2023   23:01:38  (  70.12,-169.19)    0.86                47
 06/04/2023   23:51:33   ( -70.01,  -1.71) 06/04/2023   23:51:08  ( -70.01,  -1.70)    0.25                25