Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 14.  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   (  70.54, -54.31) 12/16/2023   15:19:12  (  70.45, -52.81)   56.59                69
 12/16/2023   16:08:35   ( -69.92, 113.98) 12/16/2023   16:08:50  ( -69.90, 114.04)    3.08                15
 12/16/2023   16:59:18   (  69.76, -78.47) 12/16/2023   16:58:18  (  69.74, -78.54)    3.03                60
 12/19/2023   07:34:48   (  69.98,  62.34) 12/19/2023   07:35:51  (  69.97,  62.37)    1.51                63
 12/19/2023   08:25:30   ( -69.88,-130.20) 12/19/2023   08:25:21  ( -69.87,-130.14)    2.98                 9
 12/19/2023   09:16:05   (  69.29,  37.97) 12/19/2023   09:14:55  (  69.37,  36.83)   45.55                70
 12/21/2023   23:51:42   (  69.90, 178.24) 12/21/2023   23:52:22  (  69.91, 178.16)    3.15                40
 12/22/2023   00:42:24   ( -69.80, -14.30) 12/22/2023   00:41:52  ( -69.81, -14.35)    1.91                32
 12/24/2023   15:18:06   ( -70.66, 125.50) 12/24/2023   15:19:14  ( -70.60, 127.39)   70.15                68
 12/24/2023   16:08:37   (  69.87, -65.96) 12/24/2023   16:08:52  (  69.88, -66.00)    1.80                15
 12/24/2023   16:59:19   ( -69.78, 101.51) 12/24/2023   16:58:22  ( -69.78, 101.50)    0.81                57
 12/27/2023   07:34:47   ( -69.96,-117.63) 12/27/2023   07:35:54  ( -69.95,-117.66)    1.81                67
 12/27/2023   08:25:31   (  69.86,  49.84) 12/27/2023   08:25:21  (  69.84,  49.82)    2.41                10
 12/27/2023   09:16:07   ( -69.44,-142.23) 12/27/2023   09:14:55  ( -69.52,-142.98)   30.56                72