Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 12.  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)
 07/13/2023   15:42:51   (  69.99, -59.55) 07/13/2023   15:43:27  (  69.99, -59.61)    2.43                36
 07/13/2023   16:33:33   ( -69.90, 107.91) 07/13/2023   16:32:57  ( -69.88, 107.86)    2.97                36
 07/16/2023   07:09:11   ( -70.67,-112.14) 07/16/2023   07:10:20  ( -70.60,-110.48)   61.60                69
 07/16/2023   07:59:44   (  69.99,  56.24) 07/16/2023   07:59:56  (  70.00,  56.29)    2.92                12
 07/16/2023   08:50:26   ( -69.89,-136.30) 07/16/2023   08:49:26  ( -69.89,-136.23)    2.75                60
 07/18/2023   23:25:51   ( -70.04,   4.63) 07/18/2023   23:26:58  ( -70.05,   4.60)    2.01                67
 07/19/2023   00:16:35   (  69.93, 172.09) 07/19/2023   00:16:25  (  69.94, 172.09)    1.00                10
 07/19/2023   01:07:11   ( -69.52, -19.98) 07/19/2023   01:05:59  ( -69.61, -20.73)   31.24                72
 07/21/2023   15:42:44   ( -70.04, 120.40) 07/21/2023   15:43:27  ( -70.03, 120.45)    2.33                43
 07/21/2023   16:33:27   (  69.89, -72.06) 07/21/2023   16:32:54  (  69.91, -72.06)    3.16                33
 07/24/2023   07:09:07   (  70.78,  67.68) 07/24/2023   07:10:15  (  70.69,  69.68)   73.99                68
 07/24/2023   07:59:36   ( -69.99,-123.76) 07/24/2023   07:59:56  ( -69.98,-123.72)    1.86                20
 07/24/2023   08:50:19   (  69.84,  43.78) 07/24/2023   08:49:23  (  69.87,  43.76)    2.52                56