Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 10.  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)
 04/12/2023   15:17:59   ( -70.09, 126.67) 04/12/2023   15:18:54  ( -70.10, 126.62)    1.98                55
 04/12/2023   16:08:43   (  69.98, -65.84) 04/12/2023   16:08:21  (  69.99, -65.88)    2.20                22
 04/12/2023   16:59:11   ( -69.15, 102.67) 04/12/2023   16:58:03  ( -69.22, 100.71)   78.03                68
 04/15/2023   07:34:48   ( -70.06,-117.49) 04/15/2023   07:35:20  ( -70.06,-117.54)    1.75                32
 04/15/2023   08:25:32   (  69.95,  49.98) 04/15/2023   08:24:47  (  69.96,  49.95)    1.31                45
 04/17/2023   23:01:02   (  70.45,-169.62) 04/17/2023   23:02:13  (  70.33,-168.91)   29.94                71
 04/17/2023   23:51:38   ( -70.04,  -1.68) 04/17/2023   23:51:46  ( -70.05,  -1.67)    1.12                 8
 04/18/2023   00:42:22   (  69.93, 165.80) 04/18/2023   00:41:13  (  69.94, 165.82)    1.20                69
 04/20/2023   15:17:46   (  70.12, -53.33) 04/20/2023   15:18:42  (  70.11, -53.33)    1.12                56
 04/20/2023   16:08:28   ( -70.03, 114.13) 04/20/2023   16:08:12  ( -70.00, 114.15)    2.94                16
 04/20/2023   16:58:59   (  69.23, -77.40) 04/20/2023   16:57:50  (  69.28, -79.18)   70.42                69
 04/23/2023   07:34:35   (  70.07,  62.54) 04/23/2023   07:35:07  (  70.09,  62.53)    1.77                32
 04/23/2023   08:25:17   ( -69.97,-130.00) 04/23/2023   08:24:37  ( -69.98,-129.99)    0.74                40