Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 23.  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)
 05/25/2023   06:44:11   ( -70.93,-106.23) 05/25/2023   06:45:18  ( -70.81,-104.10)   78.92                67
 05/25/2023   07:34:41   (  70.07,  62.44) 05/25/2023   07:34:57  (  70.06,  62.43)    2.08                16
 05/25/2023   08:25:21   ( -69.94,-130.03) 05/25/2023   08:24:26  ( -69.94,-130.10)    2.35                55
 05/27/2023   23:00:50   ( -70.11,  10.84) 05/27/2023   23:01:55  ( -70.12,  10.77)    2.80                65
 05/27/2023   23:51:35   (  70.04, 178.25) 05/27/2023   23:51:22  (  70.02, 178.27)    3.26                13
 05/28/2023   00:42:09   ( -69.54, -13.68) 05/28/2023   00:40:58  ( -69.57, -14.71)   40.37                71
 05/30/2023   15:17:45   ( -70.09, 126.64) 05/30/2023   15:18:20  ( -70.11, 126.65)    2.76                35
 05/30/2023   16:08:29   (  69.97, -65.87) 05/30/2023   16:07:47  (  70.00, -65.86)    3.50                42
 06/02/2023   06:44:02   (  70.38,  74.65) 06/02/2023   06:45:13  (  70.29,  75.17)   21.50                71
 06/02/2023   07:34:40   ( -70.07,-117.56) 06/02/2023   07:34:45  ( -70.08,-117.51)    1.98                 5
 06/02/2023   08:25:24   (  69.96,  49.92) 06/02/2023   08:24:12  (  69.96,  49.97)    2.13                72
 06/04/2023   23:00:52   (  70.11,-169.17) 06/04/2023   23:01:40  (  70.11,-169.20)    1.23                48
 06/04/2023   23:51:34   ( -70.01,  -1.71) 06/04/2023   23:51:10  ( -70.01,  -1.71)    0.60                24