Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 9.  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   ( -70.13,-111.28) 04/11/2023   07:10:19  ( -70.11,-111.30)    2.61                45
 04/11/2023   08:00:18   (  70.02,  56.20) 04/11/2023   07:59:46  (  70.00,  56.20)    1.59                32
 04/13/2023   22:35:55   (  70.87,-163.99) 04/13/2023   22:37:03  (  70.78,-162.05)   71.35                68
 04/13/2023   23:26:24   ( -70.09,   4.56) 04/13/2023   23:26:43  ( -70.12,   4.61)    3.06                19
 04/14/2023   00:17:08   (  69.98, 172.04) 04/14/2023   00:16:11  (  69.95, 172.02)    3.47                57
 04/16/2023   14:52:32   (  70.16, -47.07) 04/16/2023   14:53:38  (  70.15, -47.08)    0.90                66
 04/16/2023   15:43:14   ( -70.07, 120.39) 04/16/2023   15:43:08  ( -70.04, 120.40)    3.00                 6
 04/16/2023   16:33:51   (  69.59, -71.59) 04/16/2023   16:32:40  (  69.65, -72.50)   35.78                71
 04/19/2023   07:09:20   (  70.09,  68.82) 04/19/2023   07:10:01  (  70.10,  68.74)    2.94                41
 04/19/2023   08:00:02   ( -70.00,-123.72) 04/19/2023   07:59:31  ( -69.99,-123.78)    2.37                31
 04/21/2023   22:35:39   ( -70.87,  16.05) 04/21/2023   22:36:47  ( -70.74,  17.93)   70.18                68
 04/21/2023   23:26:10   (  70.09,-175.39) 04/21/2023   23:26:24  (  70.07,-175.40)    2.20                14
 04/22/2023   00:16:52   ( -69.99,  -7.93) 04/22/2023   00:15:54  ( -69.97,  -7.92)    3.28                58