Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 18.  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)
 12/19/2023   07:34:48   (  69.95,  62.38) 12/19/2023   07:35:51  (  69.98,  62.39)    2.99                63
 12/19/2023   08:25:30   ( -69.86,-130.17) 12/19/2023   08:25:21  ( -69.87,-130.14)    1.28                 9
 12/19/2023   09:16:06   (  69.32,  37.93) 12/19/2023   09:14:55  (  69.38,  36.84)   43.21                71
 12/21/2023   23:51:42   (  69.93, 178.18) 12/21/2023   23:52:20  (  69.94, 178.21)    1.61                38
 12/22/2023   00:42:24   ( -69.84, -14.36) 12/22/2023   00:41:50  ( -69.83, -14.31)    2.11                34
 12/24/2023   15:18:04   ( -70.61, 125.59) 12/24/2023   15:19:13  ( -70.53, 127.30)   63.64                69
 12/24/2023   16:08:36   (  69.87, -65.94) 12/24/2023   16:08:50  (  69.87, -66.00)    2.40                14
 12/24/2023   16:59:18   ( -69.77, 101.51) 12/24/2023   16:58:20  ( -69.77, 101.48)    1.34                58
 12/27/2023   07:34:47   ( -69.97,-117.64) 12/27/2023   07:35:51  ( -69.99,-117.60)    2.85                64
 12/27/2023   08:25:31   (  69.86,  49.83) 12/27/2023   08:25:18  (  69.88,  49.89)    2.99                13
 12/27/2023   09:16:06   ( -69.40,-142.17) 12/27/2023   09:14:54  ( -69.45,-143.07)   35.58                72
 12/29/2023   23:51:41   ( -69.93,  -1.80) 12/29/2023   23:52:20  ( -69.92,  -1.82)    1.15                39
 12/30/2023   00:42:25   (  69.82, 165.68) 12/30/2023   00:41:47  (  69.80, 165.67)    1.70                38