Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 15.  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)
 05/17/2023   07:34:38   ( -70.10,-117.57) 05/17/2023   07:35:06  ( -70.07,-117.55)    3.19                28
 05/17/2023   08:25:22   (  69.98,  49.93) 05/17/2023   08:24:33  (  69.97,  49.95)    0.83                49
 05/19/2023   23:00:51   (  70.18,-169.25) 05/19/2023   23:02:02  (  70.19,-169.15)    3.81                71
 05/19/2023   23:51:32   ( -70.05,  -1.72) 05/19/2023   23:51:32  ( -70.07,  -1.68)    3.35                 0
 05/20/2023   00:42:14   (  69.82, 165.93) 05/20/2023   00:41:01  (  69.86, 165.66)   11.02                73
 05/22/2023   15:17:45   (  70.08, -53.34) 05/22/2023   15:18:30  (  70.10, -53.39)    2.56                45
 05/22/2023   16:08:27   ( -70.00, 114.11) 05/22/2023   16:08:00  ( -69.99, 114.09)    1.46                27
 05/25/2023   06:44:10   ( -70.90,-106.17) 05/25/2023   06:45:18  ( -70.81,-104.11)   76.04                68
 05/25/2023   07:34:40   (  70.05,  62.48) 05/25/2023   07:34:57  (  70.04,  62.41)    2.92                17
 05/25/2023   08:25:22   ( -69.96,-130.06) 05/25/2023   08:24:27  ( -69.93,-130.11)    3.18                55
 05/27/2023   23:00:51   ( -70.13,  10.82) 05/27/2023   23:01:56  ( -70.13,  10.78)    1.57                65
 05/27/2023   23:51:35   (  70.02, 178.29) 05/27/2023   23:51:23  (  70.01, 178.26)    1.65                12
 05/28/2023   00:42:10   ( -69.55, -13.70) 05/28/2023   00:40:59  ( -69.58, -14.71)   39.20                71