Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 8 7.  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)
 08/07/2023   23:50:51   ( -70.01,  -1.61) 08/07/2023   23:51:45  ( -70.03,  -1.61)    1.71                54
 08/08/2023   00:41:35   (  69.90, 165.87) 08/08/2023   00:41:13  (  69.88, 165.82)    2.87                22
 08/08/2023   01:32:03   ( -69.07, -25.62) 08/08/2023   01:30:55  ( -69.10, -27.59)   78.28                68
 08/10/2023   16:07:42   ( -69.98, 114.22) 08/10/2023   16:08:16  ( -69.96, 114.17)    2.88                34
 08/10/2023   16:58:26   (  69.87, -78.30) 08/10/2023   16:57:43  (  69.86, -78.32)    1.16                43
 08/13/2023   07:34:00   (  70.52,  61.85) 08/13/2023   07:35:10  (  70.36,  62.99)   46.04                70
 08/13/2023   08:24:33   ( -69.95,-129.95) 08/13/2023   08:24:45  ( -69.97,-129.93)    2.45                12
 08/13/2023   09:15:17   (  69.84,  37.52) 08/13/2023   09:14:13  (  69.81,  37.49)    3.41                64
 08/15/2023   23:50:42   (  70.02, 178.40) 08/15/2023   23:51:45  (  70.01, 178.38)    2.17                63
 08/16/2023   00:41:24   ( -69.93, -14.14) 08/16/2023   00:41:15  ( -69.90, -14.14)    3.51                 9
 08/16/2023   01:31:59   (  69.34, 154.03) 08/16/2023   01:30:49  (  69.40, 152.83)   47.48                70
 08/18/2023   16:07:32   (  70.01, -65.80) 08/18/2023   16:08:12  (  70.01, -65.73)    2.74                40
 08/18/2023   16:58:13   ( -69.86, 101.74) 08/18/2023   16:57:43  ( -69.85, 101.68)    2.77                30