Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 2 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)
 02/15/2023   15:18:41   (  70.10, -53.37) 02/15/2023   15:19:26  (  70.12, -53.35)    2.32                45
 02/15/2023   16:09:23   ( -70.01, 114.08) 02/15/2023   16:08:56  ( -70.00, 114.12)    1.76                27
 02/18/2023   06:45:07   ( -70.96,-106.28) 02/18/2023   06:46:14  ( -70.83,-104.06)   82.17                67
 02/18/2023   07:35:36   (  70.06,  62.46) 02/18/2023   07:35:53  (  70.07,  62.47)    1.80                17
 02/18/2023   08:26:18   ( -69.96,-130.08) 02/18/2023   08:25:23  ( -69.96,-130.06)    1.16                55
 02/20/2023   23:01:47   ( -70.14,  10.79) 02/20/2023   23:02:52  ( -70.13,  10.80)    0.45                65
 02/20/2023   23:52:31   (  70.02, 178.27) 02/20/2023   23:52:19  (  70.03, 178.29)    0.89                12
 02/21/2023   00:43:06   ( -69.56, -13.72) 02/21/2023   00:41:54  ( -69.64, -14.61)   35.36                72
 02/23/2023   15:18:42   ( -70.12, 126.58) 02/23/2023   15:19:17  ( -70.10, 126.65)    3.31                35
 02/23/2023   16:09:25   (  69.96, -65.86) 02/23/2023   16:08:44  (  69.98, -65.87)    3.09                41
 02/26/2023   06:44:57   (  70.37,  74.63) 02/26/2023   06:46:08  (  70.28,  75.18)   22.87                71
 02/26/2023   07:35:35   ( -70.06,-117.57) 02/26/2023   07:35:40  ( -70.06,-117.50)    2.56                 5
 02/26/2023   08:26:18   (  69.90,  49.98) 02/26/2023   08:25:08  (  69.89,  49.90)    3.16                70
 02/28/2023   23:01:46   (  70.07,-169.14) 02/28/2023   23:02:34  (  70.09,-169.20)    2.69                48
 02/28/2023   23:52:28   ( -69.97,  -1.66) 02/28/2023   23:52:04  ( -69.98,  -1.71)    2.18                24