Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 3 11.  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   15:18:38   ( -70.10, 126.57) 03/11/2023   15:19:10  ( -70.10, 126.64)    2.72                32
 03/11/2023   16:09:21   (  69.94, -65.86) 03/11/2023   16:08:38  (  69.94, -65.94)    2.92                43
 03/14/2023   06:44:55   (  70.54,  74.34) 03/14/2023   06:46:05  (  70.41,  75.33)   39.45                70
 03/14/2023   07:35:29   ( -70.03,-117.54) 03/14/2023   07:35:40  ( -70.03,-117.59)    1.70                11
 03/14/2023   08:26:13   (  69.92,  49.94) 03/14/2023   08:25:07  (  69.92,  49.90)    1.29                66
 03/16/2023   23:01:40   (  70.12,-169.22) 03/16/2023   23:02:39  (  70.11,-169.23)    1.06                59
 03/16/2023   23:52:22   ( -70.03,  -1.76) 03/16/2023   23:52:09  ( -70.01,  -1.74)    2.16                13
 03/17/2023   00:42:55   (  69.33, 166.56) 03/17/2023   00:41:45  (  69.40, 165.07)   58.98                70
 03/19/2023   15:18:32   (  70.09, -53.40) 03/19/2023   15:19:07  (  70.08, -53.39)    0.78                35
 03/19/2023   16:09:14   ( -69.99, 114.07) 03/19/2023   16:08:37  ( -69.98, 114.10)    1.72                37
 03/22/2023   06:44:50   ( -70.70,-105.89) 03/22/2023   06:45:59  ( -70.60,-104.40)   56.26                69
 03/22/2023   07:35:23   (  70.02,  62.48) 03/22/2023   07:35:34  (  70.04,  62.44)    3.07                11
 03/22/2023   08:26:05   ( -69.92,-130.05) 03/22/2023   08:25:04  ( -69.94,-130.07)    2.57                61
 03/24/2023   23:01:30   ( -70.12,  10.79) 03/24/2023   23:02:32  ( -70.12,  10.80)    0.22                62
 03/24/2023   23:52:14   (  70.02, 178.25) 03/24/2023   23:51:59  (  70.00, 178.27)    2.73                15
 03/25/2023   00:42:47   ( -69.45, -13.58) 03/25/2023   00:41:36  ( -69.52, -14.76)   46.83                71