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   ( -70.12,-111.25) 04/11/2023   07:10:19  ( -70.13,-111.27)    1.33                45
 04/11/2023   08:00:18   (  70.00,  56.23) 04/11/2023   07:59:46  (  70.02,  56.23)    2.33                32
 04/13/2023   22:35:56   (  70.90,-164.04) 04/13/2023   22:37:03  (  70.80,-162.02)   74.71                67
 04/13/2023   23:26:24   ( -70.08,   4.59) 04/13/2023   23:26:44  ( -70.08,   4.56)    1.15                20
 04/14/2023   00:17:08   (  69.97, 172.06) 04/14/2023   00:16:11  (  69.97, 172.05)    0.78                57
 04/16/2023   14:52:31   (  70.14, -47.05) 04/16/2023   14:53:37  (  70.17, -47.05)    3.15                66
 04/16/2023   15:43:13   ( -70.05, 120.41) 04/16/2023   15:43:07  ( -70.06, 120.42)    0.84                 6
 04/16/2023   16:33:51   (  69.63, -71.64) 04/16/2023   16:32:39  (  69.67, -72.47)   32.33                72
 04/19/2023   07:09:21   (  70.13,  68.76) 04/19/2023   07:10:01  (  70.12,  68.77)    1.28                40
 04/19/2023   08:00:03   ( -70.04,-123.78) 04/19/2023   07:59:31  ( -70.01,-123.75)    3.29                32
 04/21/2023   22:35:39   ( -70.86,  16.08) 04/21/2023   22:36:47  ( -70.76,  17.96)   69.80                68
 04/21/2023   23:26:10   (  70.08,-175.37) 04/21/2023   23:26:24  (  70.09,-175.37)    2.03                14
 04/22/2023   00:16:52   ( -69.98,  -7.91) 04/22/2023   00:15:54  ( -69.99,  -7.89)    1.05                58