Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 8.  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)
 04/09/2023   23:01:13   ( -70.33,  10.52) 04/09/2023   23:02:24  ( -70.27,  11.00)   18.89                71
 04/09/2023   23:51:53   (  70.01, 178.33) 04/09/2023   23:51:54  (  70.01, 178.26)    2.65                 1
 04/10/2023   00:42:35   ( -69.92, -14.22) 04/10/2023   00:41:23  ( -69.95, -14.19)    3.18                72
 04/12/2023   15:17:59   ( -70.13, 126.61) 04/12/2023   15:18:53  ( -70.11, 126.64)    2.89                54
 04/12/2023   16:08:43   (  70.02, -65.91) 04/12/2023   16:08:20  (  70.00, -65.86)    2.79                23
 04/12/2023   16:59:10   ( -69.14, 102.69) 04/12/2023   16:58:02  ( -69.23, 100.72)   78.37                68
 04/15/2023   07:34:48   ( -70.05,-117.48) 04/15/2023   07:35:20  ( -70.08,-117.52)    3.22                32
 04/15/2023   08:25:32   (  69.94,  50.00) 04/15/2023   08:24:47  (  69.96,  49.97)    2.76                45
 04/17/2023   23:01:02   (  70.44,-169.61) 04/17/2023   23:02:13  (  70.33,-168.90)   29.33                71
 04/17/2023   23:51:38   ( -70.03,  -1.66) 04/17/2023   23:51:46  ( -70.06,  -1.65)    3.50                 8
 04/18/2023   00:42:22   (  69.93, 165.81) 04/18/2023   00:41:13  (  69.95, 165.83)    2.83                69
 04/20/2023   15:17:46   (  70.12, -53.32) 04/20/2023   15:18:42  (  70.12, -53.31)    0.67                56
 04/20/2023   16:08:28   ( -70.02, 114.14) 04/20/2023   16:08:12  ( -70.02, 114.17)    1.39                16
 04/20/2023   16:58:59   (  69.23, -77.39) 04/20/2023   16:57:50  (  69.29, -79.17)   70.22                69