Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 4.  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)
 07/04/2023   07:34:29   ( -70.03,-117.50) 07/04/2023   07:35:02  ( -70.01,-117.54)    2.67                33
 07/04/2023   08:25:13   (  69.91,  49.98) 07/04/2023   08:24:29  (  69.91,  49.97)    0.73                44
 07/06/2023   23:00:48   (  70.51,-169.80) 07/06/2023   23:01:58  (  70.40,-168.73)   41.80                70
 07/06/2023   23:51:22   ( -70.00,  -1.68) 07/06/2023   23:51:33  ( -70.01,  -1.65)    2.00                11
 07/07/2023   00:42:06   (  69.89, 165.80) 07/07/2023   00:41:00  (  69.91, 165.85)    3.30                66
 07/09/2023   15:17:33   (  70.07, -53.33) 07/09/2023   15:18:35  (  70.05, -53.35)    2.01                62
 07/09/2023   16:08:15   ( -69.97, 114.14) 07/09/2023   16:08:05  ( -69.94, 114.13)    2.96                10
 07/09/2023   16:58:50   (  69.39, -77.70) 07/09/2023   16:57:40  (  69.40, -78.97)   49.85                70
 07/12/2023   07:34:25   (  70.00,  62.55) 07/12/2023   07:35:06  (  70.02,  62.48)    3.24                41
 07/12/2023   08:25:07   ( -69.90,-129.98) 07/12/2023   08:24:36  ( -69.91,-130.03)    2.59                31
 07/14/2023   23:00:49   ( -70.92,   9.55) 07/14/2023   23:01:56  ( -70.79,  11.85)   85.54                67
 07/14/2023   23:51:17   (  69.99, 178.34) 07/14/2023   23:51:36  (  69.97, 178.29)    3.13                19
 07/15/2023   00:41:59   ( -69.88, -14.18) 07/15/2023   00:41:06  ( -69.86, -14.22)    2.64                53
 07/17/2023   15:17:27   ( -70.13, 126.59) 07/17/2023   15:18:38  ( -70.12, 126.75)    6.04                71
 07/17/2023   16:08:09   (  69.93, -65.80) 07/17/2023   16:08:06  (  69.95, -65.84)    2.99                 3
 07/17/2023   16:58:50   ( -69.77, 101.76) 07/17/2023   16:57:37  ( -69.80, 101.57)    7.87                73