Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 6 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)
 06/18/2023   06:44:05   (  70.63,  74.23) 06/18/2023   06:45:14  (  70.51,  75.57)   51.67                69
 06/18/2023   07:34:37   ( -70.02,-117.50) 06/18/2023   07:34:51  ( -70.01,-117.51)    0.83                14
 06/18/2023   08:25:21   (  69.90,  49.99) 06/18/2023   08:24:18  (  69.91,  49.99)    1.29                63
 06/20/2023   23:00:48   (  70.09,-169.14) 06/20/2023   23:01:50  (  70.09,-169.15)    0.65                62
 06/20/2023   23:51:30   ( -70.00,  -1.69) 06/20/2023   23:51:20  ( -69.98,  -1.67)    1.57                10
 06/21/2023   00:42:05   (  69.40, 166.49) 06/21/2023   00:40:55  (  69.43, 165.22)   49.85                70
 06/23/2023   15:17:41   (  70.02, -53.27) 06/23/2023   15:18:20  (  70.03, -53.35)    3.20                39
 06/23/2023   16:08:23   ( -69.93, 114.19) 06/23/2023   16:07:50  ( -69.93, 114.14)    1.95                33
 06/26/2023   06:44:04   ( -70.80,-106.04) 06/26/2023   06:45:12  ( -70.66,-104.18)   70.05                68
 06/26/2023   07:34:35   (  70.01,  62.51) 06/26/2023   07:34:49  (  70.00,  62.50)    1.21                14
 06/26/2023   08:25:17   ( -69.91,-130.03) 06/26/2023   08:24:19  ( -69.90,-130.01)    1.60                58
 06/28/2023   23:00:44   ( -70.06,  10.90) 06/28/2023   23:01:51  ( -70.07,  10.84)    2.45                67
 06/28/2023   23:51:28   (  69.96, 178.36) 06/28/2023   23:51:18  (  69.95, 178.31)    2.04                10
 06/29/2023   00:42:04   ( -69.54, -13.70) 06/29/2023   00:40:52  ( -69.63, -14.49)   32.29                72
 07/01/2023   15:17:37   ( -70.06, 126.67) 07/01/2023   15:18:18  ( -70.05, 126.70)    2.04                41
 07/01/2023   16:08:20   (  69.91, -65.80) 07/01/2023   16:07:45  (  69.93, -65.82)    2.09                35