Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 15.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 12/16/2022   04:17:40   (  70.13, 112.03) 12/16/2022   04:18:08  (  70.13, 112.05)    0.67                28
 12/16/2022   05:08:12   ( -70.01, -80.43) 12/16/2022   05:07:38  ( -70.01, -80.48)    1.93                34
 12/18/2022   23:51:09   (  70.27, 178.45) 12/18/2022   23:52:20  (  70.26, 178.68)    8.76                71
 12/19/2022   00:41:40   ( -70.08, -13.90) 12/19/2022   00:41:51  ( -70.09, -13.93)    1.27                11
 12/19/2022   01:32:24   (  70.00, 153.54) 12/19/2022   01:31:18  (  69.99, 153.57)    2.00                66
 12/21/2022   20:15:08   ( -70.17,  52.60) 12/21/2022   20:16:04  ( -70.14,  52.59)    3.30                56
 12/21/2022   21:05:51   (  70.06,-139.91) 12/21/2022   21:05:31  (  70.04,-139.92)    2.93                20
 12/21/2022   21:56:17   ( -69.58,  28.15) 12/21/2022   21:55:06  ( -69.65,  27.19)   38.19                71
 12/24/2022   16:39:17   (  70.14, -73.39) 12/24/2022   16:39:42  (  70.12, -73.36)    3.30                25
 12/24/2022   17:29:50   ( -70.01,  94.17) 12/24/2022   17:29:12  ( -70.01,  94.13)    1.56                38
 12/27/2022   12:12:43   (  70.19,  -6.82) 12/27/2022   12:13:54  (  70.17,  -6.83)    2.12                71
 12/27/2022   13:03:17   ( -70.08, 160.71) 12/27/2022   13:03:24  ( -70.07, 160.66)    1.94                 7
 12/27/2022   13:53:59   (  69.97, -31.82) 12/27/2022   13:52:51  (  69.96, -31.86)    2.55                68