Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 6.  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   07:09:11   (  70.34,  68.36) 07/08/2023   07:10:23  (  70.22,  68.96)   26.15                72
 07/08/2023   07:59:48   ( -69.98,-123.77) 07/08/2023   07:59:55  ( -70.00,-123.73)    2.45                 7
 07/08/2023   08:50:32   (  69.87,  43.70) 07/08/2023   08:49:23  (  69.84,  43.70)    3.45                69
 07/10/2023   23:25:59   (  70.06,-175.43) 07/10/2023   23:26:56  (  70.06,-175.40)    1.33                57
 07/11/2023   00:16:41   ( -69.96,  -7.97) 07/11/2023   00:16:26  ( -69.95,  -7.92)    2.49                15
 07/11/2023   01:07:12   (  69.17, 160.50) 07/11/2023   01:06:04  (  69.24, 158.76)   69.21                68
 07/13/2023   15:42:51   (  70.00, -59.56) 07/13/2023   15:43:27  (  69.98, -59.62)    2.82                36
 07/13/2023   16:33:33   ( -69.90, 107.91) 07/13/2023   16:32:57  ( -69.88, 107.87)    2.73                36
 07/16/2023   07:09:12   ( -70.72,-112.23) 07/16/2023   07:10:20  ( -70.60,-110.48)   65.62                68
 07/16/2023   07:59:44   (  69.99,  56.23) 07/16/2023   07:59:56  (  70.00,  56.29)    2.34                12
 07/16/2023   08:50:26   ( -69.89,-136.30) 07/16/2023   08:49:26  ( -69.90,-136.23)    2.95                60
 07/18/2023   23:25:51   ( -70.03,   4.63) 07/18/2023   23:26:58  ( -70.05,   4.60)    2.24                67
 07/19/2023   00:16:35   (  69.94, 172.08) 07/19/2023   00:16:25  (  69.94, 172.09)    0.18                10
 07/19/2023   01:07:11   ( -69.51, -19.98) 07/19/2023   01:05:59  ( -69.62, -20.72)   31.19                72