Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 10 4.  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)
 10/04/2023   07:59:20   (  70.01,  56.21) 10/04/2023   08:00:20  (  70.00,  56.27)    2.56                60
 10/04/2023   08:50:01   ( -69.87,-136.28) 10/04/2023   08:49:50  ( -69.89,-136.26)    1.86                11
 10/04/2023   09:40:36   (  69.27,  31.91) 10/04/2023   09:39:26  (  69.29,  30.58)   52.43                70
 10/07/2023   00:16:13   (  69.96, 172.05) 10/07/2023   00:16:49  (  69.94, 172.07)    2.18                36
 10/07/2023   01:06:54   ( -69.82, -20.43) 10/07/2023   01:06:19  ( -69.83, -20.46)    1.26                35
 10/09/2023   15:42:32   ( -70.56, 119.57) 10/09/2023   15:43:41  ( -70.49, 121.10)   57.37                69
 10/09/2023   16:33:05   (  69.87, -72.04) 10/09/2023   16:33:17  (  69.89, -72.11)    3.38                12
 10/09/2023   17:23:47   ( -69.78,  95.41) 10/09/2023   17:22:47  ( -69.78,  95.37)    1.60                60
 10/12/2023   07:59:13   ( -69.96,-123.71) 10/12/2023   08:00:16  ( -69.96,-123.76)    2.01                63
 10/12/2023   08:49:57   (  69.85,  43.77) 10/12/2023   08:49:43  (  69.85,  43.73)    1.50                14
 10/12/2023   09:40:31   ( -69.33,-148.17) 10/12/2023   09:39:20  ( -69.36,-149.31)   44.87                71
 10/15/2023   00:16:06   ( -69.95,  -7.91) 10/15/2023   00:16:42  ( -69.94,  -7.89)    0.90                36
 10/15/2023   01:06:50   (  69.84, 159.56) 10/15/2023   01:06:09  (  69.83, 159.59)    1.99                41
 10/17/2023   15:42:23   (  70.37, -60.10) 10/17/2023   15:43:33  (  70.26, -59.17)   36.43                70
 10/17/2023   16:32:58   ( -69.90, 107.94) 10/17/2023   16:33:08  ( -69.88, 107.92)    1.66                10
 10/17/2023   17:23:42   (  69.79, -84.59) 10/17/2023   17:22:35  (  69.76, -84.60)    3.20                67