Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 29.  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)
 05/01/2023   07:34:29   ( -70.10,-117.51) 05/01/2023   07:35:12  ( -70.12,-117.48)    2.34                43
 05/01/2023   08:25:13   (  69.98,  49.99) 05/01/2023   08:24:40  (  69.96,  49.95)    2.43                33
 05/03/2023   23:00:53   (  70.67,-169.96) 05/03/2023   23:02:02  (  70.55,-168.60)   51.84                69
 05/03/2023   23:51:25   ( -70.05,  -1.67) 05/03/2023   23:51:39  ( -70.05,  -1.69)    0.44                14
 05/04/2023   00:42:09   (  69.93, 165.82) 05/04/2023   00:41:06  (  69.95, 165.81)    1.59                63
 05/06/2023   15:17:39   (  70.11, -53.31) 05/06/2023   15:18:35  (  70.12, -53.33)    1.99                56
 05/06/2023   16:08:21   ( -70.02, 114.14) 05/06/2023   16:08:05  ( -70.01, 114.15)    0.56                16
 05/06/2023   16:58:52   (  69.21, -77.37) 05/06/2023   16:57:44  (  69.24, -79.26)   74.40                68
 05/09/2023   07:34:35   (  70.09,  62.48) 05/09/2023   07:35:00  (  70.11,  62.54)    3.52                25
 05/09/2023   08:25:16   ( -69.94,-129.99) 05/09/2023   08:24:31  ( -69.95,-130.06)    2.63                45
 05/11/2023   23:00:46   ( -70.20,  10.77) 05/11/2023   23:01:57  ( -70.19,  10.90)    4.98                71
 05/11/2023   23:51:29   (  70.03, 178.33) 05/11/2023   23:51:25  (  70.02, 178.30)    2.01                 4
 05/12/2023   00:42:09   ( -69.83, -14.06) 05/12/2023   00:40:56  ( -69.85, -14.29)    9.47                73