Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 9.  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)
 09/10/2023   07:59:20   ( -70.02,-123.78) 09/10/2023   08:00:15  ( -70.01,-123.71)    2.75                55
 09/10/2023   08:50:04   (  69.89,  43.72) 09/10/2023   08:49:42  (  69.91,  43.79)    3.66                22
 09/10/2023   09:40:32   ( -69.07,-147.78) 09/10/2023   09:39:24  ( -69.14,-149.61)   73.17                68
 09/13/2023   00:16:15   ( -69.97,  -7.94) 09/13/2023   00:16:47  ( -69.95,  -7.92)    2.28                32
 09/13/2023   01:06:59   (  69.84, 159.56) 09/13/2023   01:06:14  (  69.84, 159.57)    0.66                45
 09/15/2023   15:42:34   (  70.32, -60.04) 09/15/2023   15:43:45  (  70.18, -59.35)   30.72                71
 09/15/2023   16:33:10   ( -69.92, 107.89) 09/15/2023   16:33:18  ( -69.91, 107.90)    1.72                 8
 09/15/2023   17:23:53   (  69.80, -84.62) 09/15/2023   17:22:44  (  69.80, -84.60)    0.60                69
 09/18/2023   07:59:22   (  69.98,  56.26) 09/18/2023   08:00:17  (  70.00,  56.28)    3.00                55
 09/18/2023   08:50:04   ( -69.89,-136.30) 09/18/2023   08:49:47  ( -69.90,-136.23)    2.65                17
 09/18/2023   09:40:34   (  69.03,  32.26) 09/18/2023   09:39:26  (  69.12,  30.37)   75.69                68
 09/21/2023   00:16:17   (  69.96, 172.05) 09/21/2023   00:16:47  (  69.96, 172.11)    2.18                30
 09/21/2023   01:06:58   ( -69.81, -20.41) 09/21/2023   01:06:18  ( -69.81, -20.48)    2.53                40