Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 11 20.  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)
 11/22/2023   15:17:59   ( -70.94, 125.09) 11/22/2023   15:19:05  ( -70.82, 127.75)   97.87                66
 11/22/2023   16:08:25   (  69.89, -65.93) 11/22/2023   16:08:47  (  69.90, -65.96)    1.10                22
 11/22/2023   16:59:07   ( -69.79, 101.53) 11/22/2023   16:58:17  ( -69.79, 101.53)    0.53                50
 11/25/2023   07:34:38   ( -70.02,-117.67) 11/25/2023   07:35:50  ( -70.01,-117.57)    3.96                72
 11/25/2023   08:25:21   (  69.86,  49.88) 11/25/2023   08:25:18  (  69.85,  49.85)    1.26                 3
 11/25/2023   09:16:02   ( -69.70,-142.57) 11/25/2023   09:14:48  ( -69.74,-142.66)    5.84                74
 11/27/2023   23:51:34   ( -69.93,  -1.78) 11/27/2023   23:52:22  ( -69.95,  -1.78)    1.86                48
 11/28/2023   00:42:18   (  69.83, 165.68) 11/28/2023   00:41:49  (  69.84, 165.71)    1.71                29
 11/30/2023   15:18:04   (  70.81, -54.72) 11/30/2023   15:19:11  (  70.68, -52.47)   83.74                67
 11/30/2023   16:08:31   ( -69.91, 114.01) 11/30/2023   16:08:53  ( -69.92, 114.06)    2.34                22
 11/30/2023   16:59:15   (  69.81, -78.53) 11/30/2023   16:58:20  (  69.81, -78.45)    2.91                55
 12/03/2023   07:34:45   (  69.95,  62.39) 12/03/2023   07:35:54  (  69.98,  62.38)    2.77                69
 12/03/2023   08:25:28   ( -69.90,-130.20) 12/03/2023   08:25:24  ( -69.88,-130.13)    3.56                 4
 12/03/2023   09:16:06   (  69.53,  37.64) 12/03/2023   09:14:53  (  69.60,  37.13)   21.14                73