Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 20.  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)
 09/21/2023   00:16:17   (  69.97, 172.04) 09/21/2023   00:16:47  (  69.94, 172.07)    3.33                30
 09/21/2023   01:06:58   ( -69.84, -20.45) 09/21/2023   01:06:17  ( -69.83, -20.46)    1.49                41
 09/23/2023   15:42:33   ( -70.35, 119.91) 09/23/2023   15:43:44  ( -70.28, 120.80)   34.02                71
 09/23/2023   16:33:11   (  69.91, -72.10) 09/23/2023   16:33:16  (  69.91, -72.09)    0.48                 5
 09/23/2023   17:23:52   ( -69.78,  95.41) 09/23/2023   17:22:46  ( -69.79,  95.38)    2.32                66
 09/26/2023   07:59:21   ( -69.98,-123.75) 09/26/2023   08:00:17  ( -70.00,-123.72)    2.15                56
 09/26/2023   08:50:05   (  69.86,  43.74) 09/26/2023   08:49:45  (  69.83,  43.69)    3.27                20
 09/26/2023   09:40:34   ( -69.09,-147.83) 09/26/2023   09:39:25  ( -69.17,-149.56)   69.19                69
 09/29/2023   00:16:15   ( -69.94,  -7.92) 09/29/2023   00:16:45  ( -69.95,  -7.90)    1.32                30
 09/29/2023   01:06:59   (  69.82, 159.57) 09/29/2023   01:06:12  (  69.84, 159.59)    2.00                47
 10/01/2023   15:42:29   (  70.16, -59.80) 10/01/2023   15:43:40  (  70.08, -59.46)   15.64                71
 10/01/2023   16:33:08   ( -69.91, 107.90) 10/01/2023   16:33:11  ( -69.92, 107.95)    2.35                 3
 10/01/2023   17:23:51   (  69.74, -84.54) 10/01/2023   17:22:39  (  69.75, -84.64)    3.77                72