Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 20.  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)
 02/20/2023   23:01:47   ( -70.12,  10.82) 02/20/2023   23:02:52  ( -70.15,  10.82)    3.25                65
 02/20/2023   23:52:31   (  70.00, 178.30) 02/20/2023   23:52:20  (  69.99, 178.24)    2.64                11
 02/21/2023   00:43:06   ( -69.54, -13.70) 02/21/2023   00:41:55  ( -69.60, -14.67)   37.97                71
 02/23/2023   15:18:41   ( -70.09, 126.62) 02/23/2023   15:19:17  ( -70.08, 126.61)    1.53                36
 02/23/2023   16:09:25   (  69.98, -65.90) 02/23/2023   16:08:44  (  69.97, -65.89)    0.76                41
 02/26/2023   06:44:58   (  70.38,  74.62) 02/26/2023   06:46:09  (  70.30,  75.20)   23.31                71
 02/26/2023   07:35:35   ( -70.02,-117.51) 02/26/2023   07:35:42  ( -70.02,-117.57)    2.29                 7
 02/26/2023   08:26:19   (  69.91,  49.97) 02/26/2023   08:25:09  (  69.91,  49.92)    1.72                70
 02/28/2023   23:01:48   (  70.11,-169.20) 02/28/2023   23:02:36  (  70.10,-169.20)    1.80                48
 02/28/2023   23:52:30   ( -70.01,  -1.73) 02/28/2023   23:52:06  ( -69.99,  -1.72)    3.04                24
 03/03/2023   14:28:13   ( -70.95, 137.91) 03/03/2023   14:29:20  ( -70.84, 140.17)   83.05                67
 03/03/2023   15:18:42   (  70.07, -53.36) 03/03/2023   15:18:59  (  70.07, -53.32)    1.67                17
 03/03/2023   16:09:24   ( -69.96, 114.11) 03/03/2023   16:08:29  ( -69.97, 114.16)    1.86                55