Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 9.  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)
 03/11/2023   15:18:37   ( -70.09, 126.60) 03/11/2023   15:19:05  ( -70.08, 126.64)    1.37                28
 03/11/2023   16:09:21   (  69.97, -65.92) 03/11/2023   16:08:32  (  69.98, -65.87)    1.89                49
 03/14/2023   06:44:48   (  70.16,  74.95) 03/14/2023   06:45:59  (  70.16,  75.01)    2.41                71
 03/14/2023   07:35:29   ( -70.01,-117.51) 03/14/2023   07:35:29  ( -70.04,-117.52)    3.57                 0
 03/14/2023   08:26:11   (  69.80,  50.12) 03/14/2023   08:24:58  (  69.82,  49.82)   11.93                73
 03/16/2023   23:01:40   (  70.11,-169.20) 03/16/2023   23:02:22  (  70.11,-169.16)    1.70                42
 03/16/2023   23:52:22   ( -70.01,  -1.74) 03/16/2023   23:51:52  ( -70.00,  -1.68)    2.78                30
 03/19/2023   14:27:58   ( -70.76, 138.24) 03/19/2023   14:29:07  ( -70.66, 139.91)   62.50                69
 03/19/2023   15:18:30   (  70.02, -53.30) 03/19/2023   15:18:43  (  70.05, -53.33)    3.07                13
 03/19/2023   16:09:12   ( -69.93, 114.17) 03/19/2023   16:08:13  ( -69.94, 114.15)    1.75                59
 03/22/2023   06:44:38   ( -70.11,-104.97) 03/22/2023   06:45:37  ( -70.10,-104.99)    1.39                59
 03/22/2023   07:35:22   (  70.01,  62.49) 03/22/2023   07:35:04  (  69.98,  62.49)    3.51                18