Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 20.  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)
 05/22/2023   15:17:46   (  70.10, -53.36) 05/22/2023   15:18:30  (  70.13, -53.34)    3.28                44
 05/22/2023   16:08:28   ( -70.02, 114.08) 05/22/2023   16:08:00  ( -70.01, 114.12)    1.93                28
 05/25/2023   06:44:10   ( -70.92,-106.22) 05/25/2023   06:45:17  ( -70.83,-104.07)   78.69                67
 05/25/2023   07:34:40   (  70.07,  62.46) 05/25/2023   07:34:56  (  70.07,  62.45)    0.24                16
 05/25/2023   08:25:22   ( -69.98,-130.10) 05/25/2023   08:24:26  ( -69.95,-130.08)    3.31                56
 05/27/2023   23:00:51   ( -70.16,  10.77) 05/27/2023   23:01:55  ( -70.14,  10.80)    2.02                64
 05/27/2023   23:51:35   (  70.04, 178.26) 05/27/2023   23:51:22  (  70.03, 178.29)    1.32                13
 05/28/2023   00:42:09   ( -69.53, -13.66) 05/28/2023   00:40:58  ( -69.59, -14.69)   40.25                71
 05/30/2023   15:17:45   ( -70.08, 126.65) 05/30/2023   15:18:21  ( -70.08, 126.61)    1.76                36
 05/30/2023   16:08:29   (  69.97, -65.87) 05/30/2023   16:07:48  (  69.97, -65.91)    1.64                41
 06/02/2023   06:44:02   (  70.38,  74.65) 06/02/2023   06:45:14  (  70.27,  75.13)   21.80                72
 06/02/2023   07:34:40   ( -70.07,-117.56) 06/02/2023   07:34:46  ( -70.05,-117.55)    2.20                 6
 06/02/2023   08:25:24   (  69.96,  49.91) 06/02/2023   08:24:13  (  69.94,  49.94)    2.90                71