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   15:17:25   ( -70.06, 126.70) 07/17/2023   15:18:37  ( -70.08, 126.70)    2.20                72
 07/17/2023   16:08:09   (  69.95, -65.83) 07/17/2023   16:08:05  (  69.93, -65.87)    3.18                 4
 07/17/2023   16:58:49   ( -69.76, 101.79) 07/17/2023   16:57:35  ( -69.81, 101.60)    9.60                74
 07/20/2023   07:34:17   ( -70.01,-117.45) 07/20/2023   07:35:07  ( -70.02,-117.50)    2.10                50
 07/20/2023   08:25:01   (  69.91,  50.02) 07/20/2023   08:24:34  (  69.92,  50.00)    1.61                27
 07/20/2023   09:15:26   ( -68.91,-141.24) 07/20/2023   09:14:20  ( -68.93,-143.69)   98.23                66
 07/22/2023   23:00:45   (  71.02,-170.59) 07/22/2023   23:01:51  (  70.93,-167.90)   98.07                66
 07/22/2023   23:51:09   ( -69.97,  -1.61) 07/22/2023   23:51:36  ( -69.99,  -1.65)    3.15                27
 07/23/2023   00:41:53   (  69.87, 165.86) 07/23/2023   00:41:03  (  69.89, 165.85)    2.35                50
 07/25/2023   15:17:22   (  70.19, -53.49) 07/25/2023   15:18:33  (  70.16, -53.16)   12.96                71
 07/25/2023   16:08:01   ( -69.93, 114.23) 07/25/2023   16:08:05  ( -69.94, 114.16)    2.56                 4
 07/25/2023   16:58:45   (  69.83, -78.31) 07/25/2023   16:57:32  (  69.83, -78.34)    1.27                73
 07/28/2023   07:34:10   (  70.01,  62.58) 07/28/2023   07:35:02  (  70.02,  62.54)    2.13                52
 07/28/2023   08:24:52   ( -69.90,-129.95) 07/28/2023   08:24:32  ( -69.92,-129.98)    1.85                20