Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 7 7.  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   (  70.36,  68.33) 07/08/2023   07:10:23  (  70.26,  69.01)   28.17                71
 07/08/2023   07:59:48   ( -69.95,-123.73) 07/08/2023   07:59:56  ( -69.98,-123.76)    2.71                 8
 07/08/2023   08:50:33   (  69.90,  43.67) 07/08/2023   08:49:23  (  69.88,  43.75)    3.61                70
 07/10/2023   23:25:59   (  70.03,-175.38) 07/10/2023   23:26:57  (  70.03,-175.43)    1.91                58
 07/11/2023   00:16:41   ( -69.94,  -7.92) 07/11/2023   00:16:27  ( -69.92,  -7.96)    2.24                14
 07/11/2023   01:07:13   (  69.19, 160.47) 07/11/2023   01:06:04  (  69.26, 158.80)   66.47                69
 07/13/2023   15:42:51   (  70.02, -59.60) 07/13/2023   15:43:26  (  70.00, -59.59)    2.54                35
 07/13/2023   16:33:32   ( -69.87, 107.95) 07/13/2023   16:32:56  ( -69.89, 107.89)    3.31                36
 07/16/2023   07:09:11   ( -70.70,-112.20) 07/16/2023   07:10:20  ( -70.55,-110.55)   62.80                69
 07/16/2023   07:59:43   (  69.97,  56.26) 07/16/2023   07:59:56  (  69.95,  56.22)    2.91                13
 07/16/2023   08:50:25   ( -69.87,-136.27) 07/16/2023   08:49:26  ( -69.84,-136.29)    2.82                59
 07/18/2023   23:25:51   ( -70.02,   4.65) 07/18/2023   23:26:58  ( -70.04,   4.59)    3.05                67
 07/19/2023   00:16:35   (  69.93, 172.10) 07/19/2023   00:16:25  (  69.93, 172.08)    1.07                10
 07/19/2023   01:07:11   ( -69.50, -19.96) 07/19/2023   01:06:00  ( -69.55, -20.81)   33.57                71