Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 27.  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)
 04/28/2023   15:17:34   ( -70.20, 126.58) 04/28/2023   15:18:45  ( -70.18, 126.72)    6.02                71
 04/28/2023   16:08:17   (  70.03, -65.84) 04/28/2023   16:08:13  (  70.02, -65.85)    0.52                 4
 04/28/2023   16:58:57   ( -69.84, 101.76) 04/28/2023   16:57:44  ( -69.85, 101.54)    8.60                73
 05/01/2023   07:34:29   ( -70.08,-117.48) 05/01/2023   07:35:13  ( -70.08,-117.53)    1.93                44
 05/01/2023   08:25:13   (  69.96,  50.01) 05/01/2023   08:24:40  (  69.98,  49.96)    2.45                33
 05/03/2023   23:00:53   (  70.64,-169.92) 05/03/2023   23:02:02  (  70.56,-168.59)   50.06                69
 05/03/2023   23:51:26   ( -70.08,  -1.72) 05/03/2023   23:51:39  ( -70.06,  -1.67)    2.77                13
 05/04/2023   00:42:10   (  69.96, 165.77) 05/04/2023   00:41:06  (  69.95, 165.82)    1.98                64
 05/06/2023   15:17:40   (  70.12, -53.34) 05/06/2023   15:18:35  (  70.11, -53.34)    1.10                55
 05/06/2023   16:08:22   ( -70.03, 114.11) 05/06/2023   16:08:05  ( -70.01, 114.14)    3.26                17
 05/06/2023   16:58:52   (  69.17, -77.32) 05/06/2023   16:57:44  (  69.23, -79.27)   77.07                68
 05/09/2023   07:34:35   (  70.09,  62.47) 05/09/2023   07:34:59  (  70.08,  62.50)    1.62                24
 05/09/2023   08:25:16   ( -69.94,-129.99) 05/09/2023   08:24:29  ( -69.97,-130.02)    3.36                47