Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 9.  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)
 05/09/2023   07:34:35   (  70.06,  62.52) 05/09/2023   07:35:08  (  70.07,  62.46)    3.05                33
 05/09/2023   08:25:17   ( -69.98,-130.04) 05/09/2023   08:24:38  ( -69.96,-130.07)    2.43                39
 05/11/2023   23:00:54   ( -70.52,  10.25) 05/11/2023   23:02:05  ( -70.42,  11.19)   36.74                71
 05/11/2023   23:51:31   (  70.03, 178.32) 05/11/2023   23:51:37  (  70.04, 178.29)    2.03                 6
 05/12/2023   00:42:13   ( -69.95, -14.24) 05/12/2023   00:41:07  ( -69.93, -14.23)    1.72                66
 05/14/2023   15:17:42   ( -70.13, 126.61) 05/14/2023   15:18:37  ( -70.15, 126.67)    2.27                55
 05/14/2023   16:08:26   (  70.01, -65.89) 05/14/2023   16:08:04  (  70.04, -65.84)    3.43                22
 05/14/2023   16:58:55   ( -69.24, 102.55) 05/14/2023   16:57:46  ( -69.27, 100.75)   71.34                69
 05/17/2023   07:34:37   ( -70.07,-117.53) 05/17/2023   07:35:06  ( -70.06,-117.58)    2.75                29
 05/17/2023   08:25:21   (  69.95,  49.96) 05/17/2023   08:24:33  (  69.95,  49.91)    2.24                48
 05/19/2023   23:00:51   (  70.16,-169.22) 05/19/2023   23:02:03  (  70.15,-169.20)    1.91                72
 05/19/2023   23:51:32   ( -70.02,  -1.68) 05/19/2023   23:51:33  ( -70.04,  -1.72)    2.91                 1
 05/20/2023   00:42:14   (  69.80, 165.96) 05/20/2023   00:41:01  (  69.87, 165.69)   13.20                73
 05/22/2023   15:17:46   (  70.13, -53.40) 05/22/2023   15:18:30  (  70.10, -53.38)    2.62                44
 05/22/2023   16:08:27   ( -69.98, 114.14) 05/22/2023   16:08:00  ( -70.00, 114.10)    2.81                27