Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 5.  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)
 07/05/2023   15:42:55   ( -70.00, 120.43) 07/05/2023   15:43:25  ( -69.99, 120.38)    2.40                30
 07/05/2023   16:33:39   (  69.89, -72.09) 07/05/2023   16:32:52  (  69.89, -72.12)    0.85                47
 07/08/2023   07:09:12   (  70.39,  68.29) 07/08/2023   07:10:22  (  70.29,  69.05)   30.51                70
 07/08/2023   07:59:48   ( -69.97,-123.75) 07/08/2023   07:59:56  ( -69.96,-123.79)    2.25                 8
 07/08/2023   08:50:32   (  69.86,  43.72) 07/08/2023   08:49:23  (  69.85,  43.71)    1.29                69
 07/10/2023   23:25:59   (  70.05,-175.42) 07/10/2023   23:26:56  (  70.07,-175.38)    2.11                57
 07/11/2023   00:16:41   ( -69.95,  -7.95) 07/11/2023   00:16:26  ( -69.96,  -7.90)    1.88                15
 07/11/2023   01:07:13   (  69.21, 160.44) 07/11/2023   01:06:04  (  69.24, 158.77)   65.95                69
 07/13/2023   15:42:51   (  69.99, -59.54) 07/13/2023   15:43:27  (  69.99, -59.61)    2.61                36
 07/13/2023   16:33:33   ( -69.88, 107.93) 07/13/2023   16:32:57  ( -69.89, 107.88)    2.00                36
 07/16/2023   07:09:11   ( -70.71,-112.21) 07/16/2023   07:10:19  ( -70.61,-110.47)   64.90                68
 07/16/2023   07:59:43   (  69.98,  56.24) 07/16/2023   07:59:55  (  70.00,  56.29)    3.17                12
 07/16/2023   08:50:25   ( -69.87,-136.28) 07/16/2023   08:49:26  ( -69.85,-136.29)    3.21                59
 07/18/2023   23:25:52   ( -70.07,   4.57) 07/18/2023   23:26:58  ( -70.06,   4.61)    2.56                66
 07/19/2023   00:16:35   (  69.93, 172.10) 07/19/2023   00:16:25  (  69.94, 172.09)    1.49                10