Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 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)
 06/15/2023   15:17:44   ( -70.13, 126.57) 06/15/2023   15:18:19  ( -70.11, 126.61)    2.05                35
 06/15/2023   16:08:28   (  70.01, -65.94) 06/15/2023   16:07:46  (  70.01, -65.89)    1.83                42
 06/18/2023   06:44:01   (  70.45,  74.52) 06/18/2023   06:45:12  (  70.39,  75.26)   28.29                71
 06/18/2023   07:34:37   ( -70.04,-117.53) 06/18/2023   07:34:46  ( -70.06,-117.59)    2.60                 9
 06/18/2023   08:25:21   (  69.93,  49.95) 06/18/2023   08:24:13  (  69.95,  49.90)    2.94                68
 06/20/2023   23:00:50   (  70.16,-169.27) 06/20/2023   23:01:42  (  70.14,-169.22)    3.23                52
 06/20/2023   23:51:31   ( -70.02,  -1.73) 06/20/2023   23:51:12  ( -70.03,  -1.74)    1.57                19
 06/21/2023   00:42:00   (  69.11, 166.90) 06/21/2023   00:40:53  (  69.15, 164.71)   86.89                67
 06/23/2023   15:17:43   (  70.10, -53.39) 06/23/2023   15:18:08  (  70.09, -53.40)    0.71                25
 06/23/2023   16:08:25   ( -70.00, 114.07) 06/23/2023   16:07:38  ( -69.98, 114.08)    1.71                47
 06/26/2023   06:43:53   ( -70.24,-105.15) 06/26/2023   06:45:05  ( -70.19,-105.01)    7.88                72
 06/26/2023   07:34:36   (  70.09,  62.39) 06/26/2023   07:34:32  (  70.07,  62.47)    3.25                 4
 06/26/2023   08:25:16   ( -69.88,-129.98) 06/26/2023   08:24:03  ( -69.91,-130.12)    6.75                73
 06/28/2023   23:00:45   ( -70.13,  10.79) 06/28/2023   23:01:30  ( -70.15,  10.83)    2.83                45
 06/28/2023   23:51:29   (  70.03, 178.25) 06/28/2023   23:50:57  (  70.03, 178.30)    1.98                32