Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 7.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 09/07/2023   15:42:29   ( -70.28, 120.05) 09/07/2023   15:43:41  ( -70.16, 120.63)   25.58                72
 09/07/2023   16:33:08   (  69.89, -72.04) 09/07/2023   16:33:11  (  69.90, -72.10)    2.38                 3
 09/07/2023   17:23:50   ( -69.81,  95.39) 09/07/2023   17:22:41  ( -69.78,  95.38)    2.90                69
 09/10/2023   07:59:20   ( -70.01,-123.77) 09/10/2023   08:00:15  ( -70.01,-123.71)    2.44                55
 09/10/2023   08:50:04   (  69.88,  43.73) 09/10/2023   08:49:43  (  69.85,  43.72)    3.38                21
 09/10/2023   09:40:33   ( -69.11,-147.84) 09/10/2023   09:39:24  ( -69.14,-149.61)   70.03                69
 09/13/2023   00:16:15   ( -69.96,  -7.93) 09/13/2023   00:16:47  ( -69.95,  -7.92)    1.34                32
 09/13/2023   01:06:59   (  69.83, 159.57) 09/13/2023   01:06:14  (  69.84, 159.57)    0.59                45
 09/15/2023   15:42:33   (  70.32, -60.03) 09/15/2023   15:43:44  (  70.18, -59.35)   29.97                71
 09/15/2023   16:33:09   ( -69.91, 107.90) 09/15/2023   16:33:17  ( -69.91, 107.90)    0.54                 8
 09/15/2023   17:23:53   (  69.79, -84.61) 09/15/2023   17:22:44  (  69.80, -84.61)    0.61                69
 09/18/2023   07:59:22   (  69.97,  56.27) 09/18/2023   08:00:18  (  69.95,  56.20)    3.48                56
 09/18/2023   08:50:04   ( -69.88,-136.28) 09/18/2023   08:49:47  ( -69.90,-136.23)    3.09                17
 09/18/2023   09:40:34   (  69.01,  32.27) 09/18/2023   09:39:27  (  69.07,  30.30)   78.74                67
 09/21/2023   00:16:17   (  69.94, 172.08) 09/21/2023   00:16:47  (  69.96, 172.11)    2.88                30
 09/21/2023   01:06:59   ( -69.85, -20.47) 09/21/2023   01:06:17  ( -69.87, -20.40)    3.19                42