Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 12 17.  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   (  69.98,  62.33) 12/19/2023   07:35:51  (  69.96,  62.35)    2.95                63
 12/19/2023   08:25:29   ( -69.84,-130.13) 12/19/2023   08:25:21  ( -69.85,-130.17)    1.72                 8
 12/19/2023   09:16:05   (  69.30,  37.96) 12/19/2023   09:14:55  (  69.36,  36.81)   45.74                70
 12/21/2023   23:51:43   (  69.96, 178.14) 12/21/2023   23:52:21  (  69.94, 178.20)    3.10                38
 12/22/2023   00:42:24   ( -69.81, -14.32) 12/22/2023   00:41:51  ( -69.83, -14.31)    2.23                33
 12/24/2023   15:18:06   ( -70.68, 125.47) 12/24/2023   15:19:14  ( -70.55, 127.33)   69.84                68
 12/24/2023   16:08:37   (  69.89, -65.98) 12/24/2023   16:08:51  (  69.90, -65.98)    1.00                14
 12/24/2023   16:59:19   ( -69.79, 101.48) 12/24/2023   16:58:21  ( -69.79, 101.51)    1.16                58
 12/27/2023   07:34:47   ( -69.99,-117.66) 12/27/2023   07:35:52  ( -70.00,-117.60)    2.85                65
 12/27/2023   08:25:30   (  69.83,  49.89) 12/27/2023   08:25:20  (  69.83,  49.81)    2.94                10
 12/27/2023   09:16:06   ( -69.41,-142.19) 12/27/2023   09:14:55  ( -69.45,-143.07)   34.63                71
 12/29/2023   23:51:41   ( -69.93,  -1.81) 12/29/2023   23:52:22  ( -69.91,  -1.84)    2.45                41
 12/30/2023   00:42:25   (  69.82, 165.66) 12/30/2023   00:41:49  (  69.80, 165.65)    3.17                36