Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 10.  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)
 04/11/2023   07:09:34   ( -70.14,-111.29) 04/11/2023   07:10:18  ( -70.15,-111.23)    2.84                44
 04/11/2023   08:00:18   (  70.02,  56.20) 04/11/2023   07:59:46  (  70.00,  56.19)    2.78                32
 04/13/2023   22:35:55   (  70.87,-163.99) 04/13/2023   22:37:03  (  70.77,-162.07)   71.29                68
 04/13/2023   23:26:24   ( -70.10,   4.55) 04/13/2023   23:26:43  ( -70.10,   4.59)    1.45                19
 04/14/2023   00:17:08   (  69.99, 172.03) 04/14/2023   00:16:10  (  70.00, 172.08)    2.17                58
 04/16/2023   14:52:32   (  70.17, -47.08) 04/16/2023   14:53:37  (  70.19, -47.03)    3.28                65
 04/16/2023   15:43:14   ( -70.08, 120.38) 04/16/2023   15:43:07  ( -70.08, 120.45)    2.59                 7
 04/16/2023   16:33:51   (  69.59, -71.60) 04/16/2023   16:32:40  (  69.63, -72.52)   36.08                71
 04/19/2023   07:09:20   (  70.10,  68.81) 04/19/2023   07:10:00  (  70.13,  68.78)    3.28                40
 04/19/2023   08:00:02   ( -70.01,-123.73) 04/19/2023   07:59:30  ( -70.02,-123.74)    1.04                32
 04/21/2023   22:35:38   ( -70.83,  16.13) 04/21/2023   22:36:46  ( -70.75,  17.95)   67.12                68
 04/21/2023   23:26:10   (  70.09,-175.40) 04/21/2023   23:26:23  (  70.09,-175.38)    1.18                13
 04/22/2023   00:16:52   ( -70.00,  -7.94) 04/22/2023   00:15:53  ( -69.98,  -7.90)    2.90                59
 04/24/2023   14:52:15   ( -70.15, 133.00) 04/24/2023   14:53:19  ( -70.13, 132.95)    2.56                64
 04/24/2023   15:42:59   (  70.05, -59.54) 04/24/2023   15:42:45  (  70.07, -59.50)    2.82                14
 04/24/2023   16:33:33   ( -69.53, 108.55) 04/24/2023   16:32:22  ( -69.58, 107.46)   42.86                71