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, 126.59) 04/28/2023   15:18:45  ( -70.19, 126.73)    5.43                71
 04/28/2023   16:08:17   (  70.02, -65.83) 04/28/2023   16:08:13  (  70.03, -65.85)    1.23                 4
 04/28/2023   16:58:57   ( -69.83, 101.77) 04/28/2023   16:57:44  ( -69.86, 101.55)    9.14                73
 05/01/2023   07:34:29   ( -70.07,-117.47) 05/01/2023   07:35:13  ( -70.09,-117.52)    2.61                44
 05/01/2023   08:25:14   (  70.01,  49.95) 05/01/2023   08:24:40  (  69.98,  49.97)    2.88                34
 05/03/2023   23:00:53   (  70.63,-169.90) 05/03/2023   23:02:03  (  70.51,-168.66)   47.91                70
 05/03/2023   23:51:26   ( -70.07,  -1.70) 05/03/2023   23:51:39  ( -70.07,  -1.67)    1.24                13
 05/04/2023   00:42:10   (  69.95, 165.79) 05/04/2023   00:41:06  (  69.96, 165.82)    1.50                64
 05/06/2023   15:17:40   (  70.11, -53.32) 05/06/2023   15:18:35  (  70.12, -53.33)    1.03                55
 05/06/2023   16:08:22   ( -70.02, 114.13) 05/06/2023   16:08:05  ( -70.01, 114.15)    1.06                17
 05/06/2023   16:58:52   (  69.16, -77.31) 05/06/2023   16:57:44  (  69.23, -79.26)   77.71                68
 05/09/2023   07:34:35   (  70.07,  62.49) 05/09/2023   07:34:59  (  70.09,  62.51)    1.30                24
 05/09/2023   08:25:17   ( -69.98,-130.05) 05/09/2023   08:24:29  ( -69.98,-130.01)    1.51                48