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   ( -70.35,  10.49) 04/09/2023   23:02:24  ( -70.26,  10.97)   20.56                71
 04/09/2023   23:51:53   (  70.02, 178.30) 04/09/2023   23:51:53  (  70.05, 178.31)    2.41                 0
 04/10/2023   00:42:35   ( -69.94, -14.25) 04/10/2023   00:41:23  ( -69.93, -14.21)    1.69                72
 04/12/2023   15:17:59   ( -70.10, 126.67) 04/12/2023   15:18:54  ( -70.09, 126.62)    1.81                55
 04/12/2023   16:08:43   (  69.99, -65.85) 04/12/2023   16:08:21  (  69.99, -65.88)    1.18                22
 04/12/2023   16:59:11   ( -69.16, 102.67) 04/12/2023   16:58:03  ( -69.22, 100.70)   77.83                68
 04/15/2023   07:34:48   ( -70.07,-117.50) 04/15/2023   07:35:20  ( -70.07,-117.54)    1.39                32
 04/15/2023   08:25:32   (  69.96,  49.97) 04/15/2023   08:24:47  (  69.96,  49.95)    0.75                45
 04/17/2023   23:01:02   (  70.46,-169.64) 04/17/2023   23:02:13  (  70.33,-168.90)   30.70                71
 04/17/2023   23:51:38   ( -70.05,  -1.68) 04/17/2023   23:51:46  ( -70.06,  -1.66)    1.74                 8
 04/18/2023   00:42:22   (  69.94, 165.79) 04/18/2023   00:41:13  (  69.95, 165.83)    1.77                69
 04/20/2023   15:17:46   (  70.13, -53.34) 04/20/2023   15:18:42  (  70.13, -53.31)    1.45                56
 04/20/2023   16:08:28   ( -70.03, 114.12) 04/20/2023   16:08:12  ( -70.02, 114.18)    2.66                16
 04/20/2023   16:58:59   (  69.24, -77.41) 04/20/2023   16:57:50  (  69.30, -79.16)   69.22                69