Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2024 4 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)
 04/22/2024   14:27:53   ( -71.05, 137.57) 04/22/2024   14:28:59  ( -70.95, 140.26)   98.24                66
 04/22/2024   15:18:19   (  70.00, -53.43) 04/22/2024   15:18:41  (  70.03, -53.46)    3.01                22
 04/22/2024   16:09:01   ( -69.91, 114.03) 04/22/2024   16:08:11  ( -69.91, 114.01)    0.77                50
 04/25/2024   06:44:29   ( -70.09,-105.10) 04/25/2024   06:45:36  ( -70.11,-105.08)    2.50                67
 04/25/2024   07:35:13   (  69.98,  62.38) 04/25/2024   07:35:03  (  70.00,  62.40)    2.19                10
 04/25/2024   08:25:49   ( -69.57,-129.69) 04/25/2024   08:24:37  ( -69.66,-130.42)   30.23                72
 04/27/2024   23:01:21   ( -70.04,  10.76) 04/27/2024   23:01:56  ( -70.06,  10.76)    2.47                35
 04/27/2024   23:52:05   (  69.93, 178.23) 04/27/2024   23:51:23  (  69.95, 178.24)    1.34                42
 04/30/2024   14:27:34   (  70.22, -41.05) 04/30/2024   14:28:45  (  70.15, -40.83)   11.23                71
 04/30/2024   15:18:14   ( -70.01, 126.58) 04/30/2024   15:18:16  ( -69.99, 126.57)    3.18                 2
 04/30/2024   16:08:56   (  69.80, -65.79) 04/30/2024   16:07:44  (  69.81, -66.03)    9.07                72
 05/03/2024   06:44:24   (  70.06,  74.98) 05/03/2024   06:45:04  (  70.05,  74.95)    1.85                40
 05/03/2024   07:35:06   ( -69.96,-117.55) 05/03/2024   07:34:34  ( -69.94,-117.57)    2.62                32
 05/05/2024   22:10:38   ( -70.45,  22.85) 05/05/2024   22:11:49  ( -70.37,  23.70)   32.60                71
 05/05/2024   23:01:16   (  70.03,-169.19) 05/05/2024   23:01:20  (  70.03,-169.15)    1.68                 4
 05/05/2024   23:51:58   ( -69.93,  -1.72) 05/05/2024   23:50:50  ( -69.92,  -1.67)    2.39                68