Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 3 11.  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)
 03/12/2023   22:36:29   (  70.55,-163.56) 03/12/2023   22:37:40  (  70.44,-162.59)   38.06                71
 03/12/2023   23:27:03   ( -70.04,   4.56) 03/12/2023   23:27:15  ( -70.05,   4.49)    3.09                12
 03/13/2023   00:17:48   (  69.98, 171.96) 03/13/2023   00:16:42  (  69.95, 171.99)    3.34                66
 03/15/2023   14:53:14   (  70.12, -47.11) 03/15/2023   14:54:14  (  70.13, -47.16)    2.35                60
 03/15/2023   15:43:56   ( -70.03, 120.35) 03/15/2023   15:43:44  ( -70.02, 120.32)    1.37                12
 03/15/2023   16:34:29   (  69.33, -71.32) 03/15/2023   16:33:20  (  69.42, -72.86)   61.03                69
 03/18/2023   07:10:06   (  70.13,  68.65) 03/18/2023   07:10:41  (  70.12,  68.70)    2.22                35
 03/18/2023   08:00:47   ( -69.98,-123.80) 03/18/2023   08:00:11  ( -70.01,-123.82)    3.29                36
 03/20/2023   22:36:24   ( -70.73,  16.17) 03/20/2023   22:37:33  ( -70.67,  17.75)   58.62                69
 03/20/2023   23:26:57   (  70.05,-175.45) 03/20/2023   23:27:09  (  70.07,-175.49)    2.30                12
 03/21/2023   00:17:39   ( -69.95,  -7.99) 03/21/2023   00:16:39  ( -69.96,  -8.00)    1.17                60
 03/23/2023   14:53:05   ( -70.15, 132.87) 03/23/2023   14:54:09  ( -70.15, 132.87)    0.84                64
 03/23/2023   15:43:49   (  70.05, -59.67) 03/23/2023   15:43:36  (  70.04, -59.64)    1.22                13
 03/23/2023   16:34:23   ( -69.52, 108.42) 03/23/2023   16:33:12  ( -69.61, 107.39)   41.19                71