Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 3.  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   15:42:56   ( -70.02, 120.40) 07/05/2023   15:43:25  ( -70.02, 120.43)    1.09                29
 07/05/2023   16:33:40   (  69.91, -72.13) 07/05/2023   16:32:52  (  69.92, -72.07)    2.40                48
 07/08/2023   07:09:12   (  70.36,  68.34) 07/08/2023   07:10:23  (  70.27,  69.02)   27.44                71
 07/08/2023   07:59:49   ( -69.99,-123.79) 07/08/2023   07:59:56  ( -69.99,-123.74)    1.89                 7
 07/08/2023   08:50:32   (  69.83,  43.76) 07/08/2023   08:49:24  (  69.83,  43.68)    2.95                68
 07/10/2023   23:25:59   (  70.07,-175.45) 07/10/2023   23:26:56  (  70.05,-175.41)    2.94                57
 07/11/2023   00:16:40   ( -69.92,  -7.90) 07/11/2023   00:16:26  ( -69.94,  -7.92)    3.15                14
 07/11/2023   01:07:12   (  69.18, 160.48) 07/11/2023   01:06:04  (  69.23, 158.75)   68.74                68
 07/13/2023   15:42:51   (  70.01, -59.57) 07/13/2023   15:43:26  (  70.03, -59.55)    3.20                35
 07/13/2023   16:33:33   ( -69.90, 107.90) 07/13/2023   16:32:57  ( -69.88, 107.86)    3.11                36
 07/16/2023   07:09:12   ( -70.72,-112.24) 07/16/2023   07:10:20  ( -70.61,-110.48)   66.08                68
 07/16/2023   07:59:44   (  70.00,  56.21) 07/16/2023   07:59:56  (  70.00,  56.29)    2.77                12
 07/16/2023   08:50:25   ( -69.84,-136.23) 07/16/2023   08:49:27  ( -69.84,-136.30)    2.74                58