Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 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)
 12/16/2023   15:18:03   (  70.53, -54.29) 12/16/2023   15:19:12  (  70.46, -52.79)   56.02                69
 12/16/2023   16:08:35   ( -69.91, 113.99) 12/16/2023   16:08:50  ( -69.91, 114.05)    2.18                15
 12/16/2023   16:59:18   (  69.74, -78.45) 12/16/2023   16:58:18  (  69.75, -78.53)    3.15                60
 12/19/2023   07:34:48   (  69.97,  62.36) 12/19/2023   07:35:51  (  69.98,  62.38)    1.36                63
 12/19/2023   08:25:30   ( -69.87,-130.18) 12/19/2023   08:25:21  ( -69.87,-130.14)    1.81                 9
 12/19/2023   09:16:06   (  69.34,  37.91) 12/19/2023   09:14:55  (  69.38,  36.84)   42.35                71
 12/21/2023   23:51:43   (  69.94, 178.17) 12/21/2023   23:52:22  (  69.91, 178.16)    3.18                39
 12/22/2023   00:42:24   ( -69.79, -14.29) 12/22/2023   00:41:52  ( -69.81, -14.35)    2.93                32
 12/24/2023   15:18:05   ( -70.65, 125.52) 12/24/2023   15:19:14  ( -70.54, 127.30)   67.29                69
 12/24/2023   16:08:36   (  69.86, -65.94) 12/24/2023   16:08:51  (  69.88, -66.00)    2.79                15
 12/24/2023   16:59:18   ( -69.77, 101.52) 12/24/2023   16:58:21  ( -69.78, 101.49)    1.56                57
 12/27/2023   07:34:47   ( -69.96,-117.62) 12/27/2023   07:35:54  ( -69.94,-117.68)    3.21                67
 12/27/2023   08:25:31   (  69.85,  49.85) 12/27/2023   08:25:20  (  69.88,  49.88)    3.40                11
 12/27/2023   09:16:07   ( -69.43,-142.22) 12/27/2023   09:14:55  ( -69.50,-143.00)   31.51                72