Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 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)
 07/17/2023   15:17:26   ( -70.09, 126.65) 07/17/2023   15:18:37  ( -70.10, 126.73)    3.26                71
 07/17/2023   16:08:09   (  69.93, -65.80) 07/17/2023   16:08:05  (  69.95, -65.84)    2.43                 4
 07/17/2023   16:58:49   ( -69.73, 101.82) 07/17/2023   16:57:36  ( -69.78, 101.56)   11.38                73
 07/20/2023   07:34:18   ( -70.05,-117.50) 07/20/2023   07:35:07  ( -70.04,-117.47)    1.21                49
 07/20/2023   08:25:02   (  69.94,  49.97) 07/20/2023   08:24:34  (  69.94,  50.03)    2.29                28
 07/20/2023   09:15:26   ( -68.89,-141.21) 07/20/2023   09:14:20  ( -68.94,-143.67)   98.68                66
 07/22/2023   23:51:09   ( -70.01,  -1.66) 07/22/2023   23:51:35  ( -70.00,  -1.64)    0.92                26
 07/23/2023   00:41:53   (  69.90, 165.80) 07/23/2023   00:41:02  (  69.90, 165.86)    2.31                51
 07/25/2023   15:17:21   (  70.18, -53.47) 07/25/2023   15:18:32  (  70.16, -53.16)   11.94                71
 07/25/2023   16:08:01   ( -69.97, 114.17) 07/25/2023   16:08:04  ( -69.94, 114.17)    3.47                 3
 07/25/2023   16:58:44   (  69.82, -78.29) 07/25/2023   16:57:31  (  69.83, -78.34)    2.15                73
 07/28/2023   07:34:10   (  70.00,  62.59) 07/28/2023   07:35:02  (  70.01,  62.52)    2.80                52
 07/28/2023   08:24:52   ( -69.89,-129.93) 07/28/2023   08:24:32  ( -69.91,-129.99)    2.59                20