Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 4.  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)
 04/05/2023   22:36:09   ( -70.97,  15.81) 04/05/2023   22:37:16  ( -70.87,  18.05)   82.28                67
 04/05/2023   23:26:38   (  70.08,-175.45) 04/05/2023   23:26:56  (  70.05,-175.51)    3.41                18
 04/06/2023   00:17:20   ( -69.99,  -8.00) 04/06/2023   00:16:25  ( -69.99,  -7.96)    1.52                55
 04/08/2023   14:52:45   ( -70.19, 132.86) 04/08/2023   14:53:54  ( -70.16, 132.89)    2.82                69
 04/08/2023   15:43:29   (  70.08, -59.67) 04/08/2023   15:43:21  (  70.06, -59.62)    2.96                 8
 04/08/2023   16:34:06   ( -69.72, 108.18) 04/08/2023   16:32:54  ( -69.78, 107.63)   22.04                72
 04/11/2023   07:09:34   ( -70.14,-111.29) 04/11/2023   07:10:18  ( -70.13,-111.26)    1.60                44
 04/11/2023   08:00:18   (  70.03,  56.18) 04/11/2023   07:59:45  (  70.02,  56.22)    2.36                33
 04/13/2023   22:35:54   (  70.83,-163.93) 04/13/2023   22:37:02  (  70.77,-162.06)   68.64                68
 04/13/2023   23:26:24   ( -70.11,   4.54) 04/13/2023   23:26:42  ( -70.11,   4.61)    2.45                18
 04/14/2023   00:17:08   (  70.00, 172.01) 04/14/2023   00:16:09  (  70.00, 172.09)    3.00                59
 04/16/2023   14:52:32   (  70.18, -47.10) 04/16/2023   14:53:36  (  70.16, -47.06)    2.84                64
 04/16/2023   15:43:13   ( -70.03, 120.44) 04/16/2023   15:43:06  ( -70.06, 120.42)    2.65                 7
 04/16/2023   16:33:50   (  69.56, -71.54) 04/16/2023   16:32:39  (  69.61, -72.55)   39.48                71