Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 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)
 05/11/2023   23:00:54   ( -70.54,  10.22) 05/11/2023   23:02:05  ( -70.40,  11.15)   38.31                71
 05/11/2023   23:51:31   (  70.05, 178.30) 05/11/2023   23:51:37  (  70.02, 178.26)    2.90                 6
 05/12/2023   00:42:13   ( -69.97, -14.26) 05/12/2023   00:41:06  ( -69.96, -14.19)    2.89                67
 05/14/2023   15:17:42   ( -70.11, 126.66) 05/14/2023   15:18:38  ( -70.11, 126.62)    1.77                56
 05/14/2023   16:08:26   (  69.98, -65.84) 05/14/2023   16:08:05  (  70.01, -65.88)    3.30                21
 05/14/2023   16:58:55   ( -69.21, 102.60) 05/14/2023   16:57:47  ( -69.23, 100.70)   74.82                68
 05/17/2023   07:34:38   ( -70.10,-117.57) 05/17/2023   07:35:05  ( -70.12,-117.49)    3.43                27
 05/17/2023   08:25:22   (  69.98,  49.92) 05/17/2023   08:24:33  (  69.95,  49.92)    3.01                49
 05/19/2023   23:00:50   (  70.15,-169.19) 05/19/2023   23:02:02  (  70.14,-169.21)    1.20                72
 05/19/2023   23:51:32   ( -70.06,  -1.74) 05/19/2023   23:51:32  ( -70.03,  -1.73)    2.89                 0
 05/20/2023   00:42:13   (  69.78, 165.99) 05/20/2023   00:41:00  (  69.86, 165.68)   14.95                73
 05/22/2023   15:17:45   (  70.12, -53.38) 05/22/2023   15:18:28  (  70.12, -53.35)    1.32                43
 05/22/2023   16:08:27   ( -70.02, 114.08) 05/22/2023   16:07:58  ( -70.02, 114.13)    2.36                29