Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 19.  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)
 06/19/2023   14:52:29   (  70.47, -47.63) 06/19/2023   14:53:40  (  70.35, -46.71)   36.61                71
 06/19/2023   15:43:04   ( -70.01, 120.40) 06/19/2023   15:43:14  ( -70.02, 120.44)    1.53                10
 06/19/2023   16:33:48   (  69.90, -72.12) 06/19/2023   16:32:41  (  69.92, -72.06)    3.31                67
 06/22/2023   07:09:15   (  70.09,  68.74) 06/22/2023   07:10:13  (  70.07,  68.77)    1.82                58
 06/22/2023   07:59:56   ( -69.94,-123.72) 06/22/2023   07:59:43  ( -69.96,-123.76)    2.29                13
 06/22/2023   08:50:29   (  69.24,  44.60) 06/22/2023   08:49:20  (  69.30,  42.99)   63.74                69
 06/24/2023   23:26:08   (  70.02,-175.39) 06/24/2023   23:26:42  (  70.04,-175.39)    2.00                34
 06/25/2023   00:16:50   ( -69.93,  -7.93) 06/25/2023   00:16:12  ( -69.93,  -7.91)    0.81                38
 06/27/2023   14:52:27   ( -70.60, 132.17) 06/27/2023   14:53:37  ( -70.48, 133.49)   50.54                70
 06/27/2023   15:43:01   (  69.97, -59.54) 06/27/2023   15:43:11  (  69.99, -59.58)    2.70                10
 06/27/2023   16:33:43   ( -69.87, 107.93) 06/27/2023   16:32:41  ( -69.88, 107.90)    1.52                62
 06/30/2023   07:09:11   ( -70.07,-111.23) 06/30/2023   07:10:12  ( -70.08,-111.21)    1.06                61
 06/30/2023   07:59:55   (  69.97,  56.23) 06/30/2023   07:59:39  (  69.96,  56.28)    2.03                16
 06/30/2023   08:50:27   ( -69.34,-135.53) 06/30/2023   08:49:17  ( -69.42,-136.83)   51.94                70
 07/02/2023   23:26:03   ( -70.02,   4.61) 07/02/2023   23:26:39  ( -70.03,   4.62)    0.94                36
 07/03/2023   00:16:47   (  69.93, 172.07) 07/03/2023   00:16:06  (  69.92, 172.11)    1.80                41