Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 15.  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)
 09/15/2023   15:42:33   (  70.31, -60.02) 09/15/2023   15:43:44  (  70.20, -59.32)   28.72                71
 09/15/2023   16:33:09   ( -69.91, 107.90) 09/15/2023   16:33:17  ( -69.92, 107.92)    1.27                 8
 09/15/2023   17:23:53   (  69.78, -84.59) 09/15/2023   17:22:45  (  69.77, -84.65)    2.74                68
 09/18/2023   07:59:22   (  69.96,  56.28) 09/18/2023   08:00:18  (  69.96,  56.22)    2.27                56
 09/18/2023   08:50:04   ( -69.88,-136.28) 09/18/2023   08:49:47  ( -69.91,-136.23)    3.31                17
 09/18/2023   09:40:35   (  69.06,  32.20) 09/18/2023   09:39:27  (  69.08,  30.31)   75.12                68
 09/21/2023   00:16:17   (  69.95, 172.07) 09/21/2023   00:16:47  (  69.96, 172.10)    2.02                30
 09/21/2023   01:06:59   ( -69.86, -20.49) 09/21/2023   01:06:17  ( -69.85, -20.42)    2.92                42
 09/23/2023   15:42:34   ( -70.37, 119.87) 09/23/2023   15:43:45  ( -70.25, 120.76)   35.89                71
 09/23/2023   16:33:11   (  69.89, -72.07) 09/23/2023   16:33:17  (  69.87, -72.14)    3.19                 6
 09/23/2023   17:23:52   ( -69.80,  95.37) 09/23/2023   17:22:45  ( -69.82,  95.42)    2.78                67
 09/26/2023   07:59:20   ( -69.96,-123.71) 09/26/2023   08:00:17  ( -69.97,-123.76)    2.36                57
 09/26/2023   08:50:04   (  69.84,  43.77) 09/26/2023   08:49:44  (  69.86,  43.73)    2.43                20
 09/26/2023   09:40:34   ( -69.11,-147.87) 09/26/2023   09:39:25  ( -69.15,-149.59)   68.37                69
 09/29/2023   00:16:14   ( -69.91,  -7.88) 09/29/2023   00:16:45  ( -69.92,  -7.93)    2.18                31
 09/29/2023   01:06:58   (  69.80, 159.59) 09/29/2023   01:06:12  (  69.81, 159.55)    1.73                46