Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 18.  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)
 06/20/2023   23:00:49   (  70.10,-169.17) 06/20/2023   23:01:50  (  70.12,-169.10)    3.43                61
 06/20/2023   23:51:30   ( -69.96,  -1.64) 06/20/2023   23:51:21  ( -69.96,  -1.70)    2.46                 9
 06/21/2023   00:42:05   (  69.37, 166.54) 06/21/2023   00:40:55  (  69.47, 165.26)   51.06                70
 06/23/2023   15:17:41   (  70.04, -53.30) 06/23/2023   15:18:19  (  70.06, -53.31)    2.67                38
 06/23/2023   16:08:23   ( -69.95, 114.16) 06/23/2023   16:07:49  ( -69.96, 114.18)    1.48                34
 06/26/2023   06:44:03   ( -70.77,-105.99) 06/26/2023   06:45:11  ( -70.69,-104.14)   68.54                68
 06/26/2023   07:34:35   (  70.03,  62.48) 06/26/2023   07:34:48  (  70.03,  62.54)    2.30                13
 06/26/2023   08:25:16   ( -69.88,-129.98) 06/26/2023   08:24:19  ( -69.87,-130.05)    2.89                57
 06/28/2023   23:00:44   ( -70.08,  10.87) 06/28/2023   23:01:50  ( -70.09,  10.87)    1.14                66
 06/28/2023   23:51:28   (  69.98, 178.33) 06/28/2023   23:51:17  (  69.98, 178.35)    0.86                11
 06/29/2023   00:42:04   ( -69.56, -13.73) 06/29/2023   00:40:52  ( -69.60, -14.54)   31.41                72
 07/01/2023   15:17:37   ( -70.03, 126.71) 07/01/2023   15:18:19  ( -70.02, 126.65)    2.97                42
 07/01/2023   16:08:21   (  69.93, -65.83) 07/01/2023   16:07:45  (  69.95, -65.79)    2.37                36