Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 9 18.  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)
 09/18/2023   07:59:22   (  69.97,  56.27) 09/18/2023   08:00:18  (  69.96,  56.21)    2.45                56
 09/18/2023   08:50:04   ( -69.89,-136.30) 09/18/2023   08:49:47  ( -69.90,-136.24)    2.37                17
 09/18/2023   09:40:35   (  69.07,  32.19) 09/18/2023   09:39:27  (  69.08,  30.31)   74.95                68
 09/21/2023   00:16:17   (  69.95, 172.06) 09/21/2023   00:16:47  (  69.96, 172.10)    1.51                30
 09/21/2023   01:06:58   ( -69.82, -20.42) 09/21/2023   01:06:17  ( -69.85, -20.43)    3.16                41
 09/23/2023   15:42:34   ( -70.38, 119.87) 09/23/2023   15:43:45  ( -70.25, 120.75)   36.19                71
 09/23/2023   16:33:11   (  69.89, -72.07) 09/23/2023   16:33:17  (  69.87, -72.14)    3.50                 6
 09/23/2023   17:23:53   ( -69.81,  95.37) 09/23/2023   17:22:46  ( -69.81,  95.41)    1.99                67
 09/26/2023   07:59:20   ( -69.95,-123.71) 09/26/2023   08:00:17  ( -69.96,-123.77)    2.37                57
 09/26/2023   08:50:04   (  69.84,  43.77) 09/26/2023   08:49:44  (  69.85,  43.72)    2.76                20
 09/26/2023   09:40:34   ( -69.11,-147.87) 09/26/2023   09:39:25  ( -69.14,-149.60)   68.77                69
 09/29/2023   00:16:14   ( -69.91,  -7.87) 09/29/2023   00:16:45  ( -69.92,  -7.94)    2.90                31
 09/29/2023   01:06:58   (  69.79, 159.61) 09/29/2023   01:06:12  (  69.80, 159.54)    2.70                46
 10/01/2023   15:42:29   (  70.12, -59.75) 10/01/2023   15:43:40  (  70.10, -59.42)   12.54                71
 10/01/2023   16:33:08   ( -69.87, 107.95) 10/01/2023   16:33:12  ( -69.89, 107.91)    2.53                 4
 10/01/2023   17:23:52   (  69.76, -84.57) 10/01/2023   17:22:39  (  69.77, -84.61)    1.84                73