Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 12.  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,  10.75)    2.36                63
 06/12/2023   23:51:35   (  70.05, 178.22) 06/12/2023   23:51:20  (  70.03, 178.26)    2.67                15
 06/13/2023   00:42:08   ( -69.50, -13.64) 06/13/2023   00:40:57  ( -69.53, -14.80)   45.52                71
 06/15/2023   15:17:44   ( -70.09, 126.63) 06/15/2023   15:18:20  ( -70.10, 126.58)    2.10                36
 06/15/2023   16:08:28   (  69.97, -65.88) 06/15/2023   16:07:47  (  69.99, -65.92)    2.78                41
 06/18/2023   06:44:01   (  70.47,  74.49) 06/18/2023   06:45:12  (  70.36,  75.22)   29.38                71
 06/18/2023   07:34:37   ( -70.06,-117.56) 06/18/2023   07:34:45  ( -70.09,-117.55)    3.15                 8
 06/18/2023   08:25:21   (  69.94,  49.92) 06/18/2023   08:24:13  (  69.92,  49.87)    3.43                68
 06/20/2023   23:00:49   (  70.13,-169.22) 06/20/2023   23:01:41  (  70.16,-169.19)    2.90                52
 06/20/2023   23:51:31   ( -70.04,  -1.75) 06/20/2023   23:51:11  ( -70.05,  -1.71)    2.09                20
 06/21/2023   00:41:59   (  69.07, 166.95) 06/21/2023   00:40:52  (  69.16, 164.73)   88.39                67
 06/23/2023   15:17:42   (  70.07, -53.35) 06/23/2023   15:18:07  (  70.09, -53.40)    3.15                25
 06/23/2023   16:08:24   ( -69.97, 114.12) 06/23/2023   16:07:37  ( -69.98, 114.09)    2.32                47
 06/26/2023   06:43:53   ( -70.22,-105.11) 06/26/2023   06:45:05  ( -70.17,-105.04)    5.75                72
 06/26/2023   07:34:36   (  70.06,  62.43) 06/26/2023   07:34:32  (  70.05,  62.44)    1.32                 4
 06/26/2023   08:25:16   ( -69.85,-129.94) 06/26/2023   08:24:03  ( -69.89,-130.15)    9.21                73