Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 1 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)
 01/13/2023   07:10:35   (  70.12,  68.74) 01/13/2023   07:11:06  (  70.11,  68.74)    1.23                31
 01/13/2023   08:01:16   ( -69.98,-123.73) 01/13/2023   08:00:36  ( -70.00,-123.79)    2.88                40
 01/15/2023   22:36:50   ( -70.53,  16.55) 01/15/2023   22:38:01  ( -70.42,  17.42)   35.04                71
 01/15/2023   23:27:28   (  70.10,-175.47) 01/15/2023   23:27:32  (  70.09,-175.40)    3.15                 4
 01/16/2023   00:18:09   ( -69.96,  -7.94) 01/16/2023   00:17:02  ( -69.98,  -7.92)    2.20                67
 01/18/2023   14:53:37   ( -70.16, 132.90) 01/18/2023   14:54:32  ( -70.15, 132.93)    1.07                55
 01/18/2023   15:44:21   (  70.05, -59.62) 01/18/2023   15:43:59  (  70.04, -59.58)    1.43                22
 01/18/2023   16:34:49   ( -69.21, 108.91) 01/18/2023   16:33:41  ( -69.27, 107.00)   75.62                68
 01/21/2023   07:10:30   ( -70.10,-111.25) 01/21/2023   07:10:59  ( -70.08,-111.28)    3.25                29
 01/21/2023   08:01:14   (  70.00,  56.22) 01/21/2023   08:00:25  (  70.02,  56.27)    2.94                49
 01/23/2023   22:36:42   (  70.21,-162.96) 01/23/2023   22:37:54  (  70.19,-162.87)    4.70                72
 01/23/2023   23:27:23   ( -70.06,   4.59) 01/23/2023   23:27:24  ( -70.08,   4.62)    2.58                 1
 01/24/2023   00:18:05   (  69.85, 172.21) 01/24/2023   00:16:52  (  69.91, 172.02)    9.88                73