Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 10.  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)
 06/12/2023   23:00:50   ( -70.12,  10.81) 06/12/2023   23:01:53  ( -70.14,  10.76)    3.20                63
 06/12/2023   23:51:35   (  70.05, 178.22) 06/12/2023   23:51:20  (  70.04, 178.26)    2.18                15
 06/13/2023   00:42:08   ( -69.49, -13.63) 06/13/2023   00:40:57  ( -69.54, -14.79)   45.63                71
 06/15/2023   15:17:44   ( -70.08, 126.64) 06/15/2023   15:18:20  ( -70.10, 126.59)    2.99                36
 06/15/2023   16:08:29   (  70.02, -65.96) 06/15/2023   16:07:47  (  70.00, -65.91)    3.18                42
 06/18/2023   06:44:01   (  70.46,  74.49) 06/18/2023   06:45:12  (  70.37,  75.23)   29.32                71
 06/18/2023   07:34:37   ( -70.05,-117.55) 06/18/2023   07:34:46  ( -70.04,-117.61)    2.58                 9
 06/18/2023   08:25:21   (  69.94,  49.93) 06/18/2023   08:24:13  (  69.93,  49.88)    2.33                68
 06/20/2023   23:00:49   (  70.13,-169.22) 06/20/2023   23:01:42  (  70.12,-169.25)    2.30                53
 06/20/2023   23:51:31   ( -70.03,  -1.75) 06/20/2023   23:51:12  ( -70.01,  -1.77)    2.71                19
 06/21/2023   00:41:59   (  69.08, 166.95) 06/21/2023   00:40:52  (  69.17, 164.75)   87.83                67
 06/23/2023   15:17:43   (  70.12, -53.43) 06/23/2023   15:18:07  (  70.11, -53.37)    2.73                24
 06/23/2023   16:08:25   ( -70.02, 114.04) 06/23/2023   16:07:37  ( -70.01, 114.12)    3.24                48