Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 30.  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)
 10/01/2023   15:42:35   (  70.48, -60.30) 10/01/2023   15:43:45  (  70.37, -59.08)   46.79                70
 10/01/2023   16:33:08   ( -69.92, 107.88) 10/01/2023   16:33:21  ( -69.93, 107.92)    2.04                13
 10/01/2023   17:23:52   (  69.79, -84.62) 10/01/2023   17:22:49  (  69.77, -84.65)    2.55                63
 10/04/2023   07:59:20   (  69.99,  56.23) 10/04/2023   08:00:21  (  69.98,  56.23)    1.28                61
 10/04/2023   08:50:01   ( -69.85,-136.24) 10/04/2023   08:49:51  ( -69.87,-136.29)    2.39                10
 10/04/2023   09:40:36   (  69.25,  31.93) 10/04/2023   09:39:26  (  69.32,  30.61)   52.42                70
 10/07/2023   00:16:13   (  69.93, 172.09) 10/07/2023   00:16:50  (  69.93, 172.05)    1.53                37
 10/07/2023   01:06:55   ( -69.85, -20.46) 10/07/2023   01:06:20  ( -69.82, -20.46)    2.82                35
 10/09/2023   15:42:32   ( -70.58, 119.55) 10/09/2023   15:43:41  ( -70.50, 121.13)   59.09                69
 10/09/2023   16:33:05   (  69.89, -72.07) 10/09/2023   16:33:17  (  69.90, -72.10)    1.28                12
 10/09/2023   17:23:47   ( -69.80,  95.38) 10/09/2023   17:22:47  ( -69.79,  95.39)    0.61                60
 10/12/2023   07:59:14   ( -69.97,-123.72) 10/12/2023   08:00:18  ( -69.95,-123.78)    2.98                64
 10/12/2023   08:49:58   (  69.86,  43.75) 10/12/2023   08:49:45  (  69.83,  43.70)    3.37                13
 10/12/2023   09:40:32   ( -69.34,-148.18) 10/12/2023   09:39:21  ( -69.40,-149.25)   42.78                71