Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2022 12 19.  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)
 12/21/2022   20:15:08   ( -70.19,  52.58) 12/21/2022   20:16:03  ( -70.18,  52.64)    2.52                55
 12/21/2022   21:05:51   (  70.08,-139.93) 12/21/2022   21:05:30  (  70.07,-139.87)    2.65                21
 12/21/2022   21:56:17   ( -69.60,  28.13) 12/21/2022   21:55:06  ( -69.63,  27.15)   37.97                71
 12/24/2022   16:39:17   (  70.11, -73.33) 12/24/2022   16:39:43  (  70.10, -73.39)    2.33                26
 12/24/2022   17:29:51   ( -70.02,  94.14) 12/24/2022   17:29:12  ( -70.04,  94.17)    2.33                39
 12/27/2022   12:12:43   (  70.21,  -6.84) 12/27/2022   12:13:53  (  70.21,  -6.78)    2.17                70
 12/27/2022   13:03:17   ( -70.09, 160.68) 12/27/2022   13:03:23  ( -70.10, 160.70)    0.89                 6
 12/27/2022   13:53:59   (  69.99, -31.84) 12/27/2022   13:52:50  (  69.99, -31.82)    0.86                69
 12/30/2022   08:36:44   ( -70.18,-132.80) 12/30/2022   08:37:34  ( -70.19,-132.73)    2.92                50
 12/30/2022   09:27:25   (  70.06,  34.71) 12/30/2022   09:27:01  (  70.07,  34.75)    2.41                24
 12/30/2022   10:17:50   ( -69.43,-157.03) 12/30/2022   10:16:40  ( -69.47,-158.44)   55.27                70
 01/02/2023   04:10:26   ( -71.07, -67.59) 01/02/2023   04:11:32  ( -70.96, -65.12)   89.93                66
 01/02/2023   05:00:51   (  70.15, 101.22) 01/02/2023   05:01:12  (  70.13, 101.29)    2.85                21
 01/02/2023   05:51:26   ( -70.01, -91.23) 01/02/2023   05:50:42  ( -70.03, -91.22)    2.20                44