Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 8.  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   (  70.05,  62.52) 05/09/2023   07:35:08  (  70.08,  62.46)    3.32                33
 05/09/2023   08:25:17   ( -69.97,-130.04) 05/09/2023   08:24:38  ( -69.96,-130.07)    1.96                39
 05/11/2023   23:00:54   ( -70.52,  10.25) 05/11/2023   23:02:05  ( -70.42,  11.19)   36.56                71
 05/11/2023   23:51:31   (  70.03, 178.32) 05/11/2023   23:51:37  (  70.04, 178.29)    2.08                 6
 05/12/2023   00:42:13   ( -69.95, -14.23) 05/12/2023   00:41:07  ( -69.93, -14.23)    1.57                66
 05/14/2023   15:17:42   ( -70.13, 126.62) 05/14/2023   15:18:37  ( -70.14, 126.66)    1.77                55
 05/14/2023   16:08:26   (  70.01, -65.89) 05/14/2023   16:08:04  (  70.03, -65.85)    2.70                22
 05/14/2023   16:58:54   ( -69.19, 102.63) 05/14/2023   16:57:46  ( -69.26, 100.74)   75.11                68
 05/17/2023   07:34:37   ( -70.07,-117.53) 05/17/2023   07:35:05  ( -70.10,-117.52)    3.06                28
 05/17/2023   08:25:21   (  69.95,  49.96) 05/17/2023   08:24:33  (  69.93,  49.89)    3.56                48
 05/19/2023   23:00:51   (  70.17,-169.23) 05/19/2023   23:02:02  (  70.18,-169.15)    3.49                71
 05/19/2023   23:51:32   ( -70.02,  -1.69) 05/19/2023   23:51:33  ( -70.03,  -1.74)    2.19                 1
 05/20/2023   00:42:14   (  69.80, 165.95) 05/20/2023   00:41:01  (  69.85, 165.66)   12.60                73