Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 8.  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)
 07/08/2023   07:09:12   (  70.39,  68.29) 07/08/2023   07:10:22  (  70.29,  69.05)   30.48                70
 07/08/2023   07:59:48   ( -69.98,-123.76) 07/08/2023   07:59:56  ( -69.95,-123.79)    2.91                 8
 07/08/2023   08:50:32   (  69.86,  43.72) 07/08/2023   08:49:23  (  69.85,  43.71)    1.20                69
 07/10/2023   23:25:59   (  70.05,-175.42) 07/10/2023   23:26:56  (  70.06,-175.39)    1.53                57
 07/11/2023   00:16:41   ( -69.96,  -7.96) 07/11/2023   00:16:26  ( -69.95,  -7.91)    1.77                15
 07/11/2023   01:07:13   (  69.21, 160.44) 07/11/2023   01:06:04  (  69.24, 158.77)   66.00                69
 07/13/2023   15:42:51   (  69.99, -59.55) 07/13/2023   15:43:27  (  69.98, -59.62)    3.24                36
 07/13/2023   16:33:33   ( -69.89, 107.92) 07/13/2023   16:32:57  ( -69.87, 107.86)    3.45                36
 07/16/2023   07:09:10   ( -70.67,-112.15) 07/16/2023   07:10:19  ( -70.58,-110.51)   61.21                69
 07/16/2023   07:59:43   (  69.99,  56.23) 07/16/2023   07:59:55  (  69.98,  56.26)    1.98                12
 07/16/2023   08:50:25   ( -69.89,-136.30) 07/16/2023   08:49:25  ( -69.88,-136.25)    2.60                60
 07/18/2023   23:25:51   ( -70.04,   4.61) 07/18/2023   23:26:57  ( -70.07,   4.63)    3.20                66
 07/19/2023   00:16:35   (  69.95, 172.07) 07/19/2023   00:16:24  (  69.96, 172.12)    2.28                11
 07/19/2023   01:07:11   ( -69.53, -19.99) 07/19/2023   01:05:59  ( -69.58, -20.77)   30.93                72
 07/21/2023   15:42:43   ( -70.00, 120.45) 07/21/2023   15:43:26  ( -70.03, 120.46)    2.97                43
 07/21/2023   16:33:27   (  69.91, -72.10) 07/21/2023   16:32:53  (  69.91, -72.06)    1.61                34