Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 16.  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)
 07/17/2023   15:17:26   ( -70.10, 126.64) 07/17/2023   15:18:37  ( -70.10, 126.73)    3.24                71
 07/17/2023   16:08:09   (  69.94, -65.80) 07/17/2023   16:08:05  (  69.95, -65.84)    1.92                 4
 07/17/2023   16:58:49   ( -69.74, 101.81) 07/17/2023   16:57:36  ( -69.78, 101.55)   10.82                73
 07/20/2023   07:34:18   ( -70.05,-117.50) 07/20/2023   07:35:07  ( -70.04,-117.47)    1.57                49
 07/20/2023   08:25:02   (  69.94,  49.97) 07/20/2023   08:24:34  (  69.94,  50.03)    2.60                28
 07/20/2023   09:15:26   ( -68.89,-141.21) 07/20/2023   09:14:20  ( -68.95,-143.67)   98.29                66
 07/22/2023   23:51:10   ( -70.01,  -1.66) 07/22/2023   23:51:36  ( -70.02,  -1.62)    1.82                26
 07/23/2023   00:41:54   (  69.90, 165.80) 07/23/2023   00:41:03  (  69.91, 165.88)    2.86                51
 07/25/2023   15:17:21   (  70.18, -53.46) 07/25/2023   15:18:33  (  70.13, -53.21)   11.24                72
 07/25/2023   16:08:01   ( -69.97, 114.17) 07/25/2023   16:08:04  ( -69.96, 114.20)    1.13                 3
 07/25/2023   16:58:44   (  69.82, -78.29) 07/25/2023   16:57:31  (  69.85, -78.31)    4.25                73
 07/28/2023   07:34:11   (  70.04,  62.52) 07/28/2023   07:35:02  (  70.05,  62.57)    2.00                51
 07/28/2023   08:24:53   ( -69.94,-130.00) 07/28/2023   08:24:32  ( -69.94,-129.94)    2.32                21