Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 17.  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)
 04/17/2023   23:01:05   (  70.59,-169.86) 04/17/2023   23:02:15  (  70.50,-168.67)   44.88                70
 04/17/2023   23:51:38   ( -70.03,  -1.67) 04/17/2023   23:51:51  ( -70.06,  -1.68)    2.82                13
 04/18/2023   00:42:22   (  69.92, 165.82) 04/18/2023   00:41:19  (  69.90, 165.74)    3.34                63
 04/20/2023   15:17:45   (  70.12, -53.32) 04/20/2023   15:18:50  (  70.11, -53.37)    1.98                65
 04/20/2023   16:08:27   ( -70.03, 114.12) 04/20/2023   16:08:19  ( -70.05, 114.18)    3.24                 8
 04/20/2023   16:59:04   (  69.55, -77.85) 04/20/2023   16:57:53  (  69.56, -78.85)   38.89                71
 04/23/2023   07:34:35   (  70.13,  62.44) 04/23/2023   07:35:18  (  70.11,  62.51)    3.40                43
 04/23/2023   08:25:16   ( -69.99,-130.02) 04/23/2023   08:24:48  ( -70.00,-130.01)    1.59                28
 04/25/2023   23:51:23   (  70.05, 178.35) 04/25/2023   23:51:46  (  70.07, 178.34)    2.29                23
 04/26/2023   00:42:05   ( -69.96, -14.19) 04/26/2023   00:41:16  ( -69.97, -14.18)    0.66                49
 04/28/2023   15:17:32   ( -70.35, 126.37) 04/28/2023   15:18:44  ( -70.27, 126.86)   20.49                72
 04/28/2023   16:08:12   (  70.04, -65.84) 04/28/2023   16:08:13  (  70.05, -65.82)    0.87                 1
 04/28/2023   16:58:54   ( -69.95, 101.62) 04/28/2023   16:57:43  ( -69.94, 101.67)    1.85                71