Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 14.  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)
 04/15/2023   07:34:48   ( -70.07,-117.50) 04/15/2023   07:35:20  ( -70.06,-117.55)    2.17                32
 04/15/2023   08:25:32   (  69.95,  49.98) 04/15/2023   08:24:47  (  69.96,  49.95)    1.24                45
 04/17/2023   23:01:02   (  70.45,-169.63) 04/17/2023   23:02:13  (  70.32,-168.92)   30.47                71
 04/17/2023   23:51:38   ( -70.05,  -1.69) 04/17/2023   23:51:46  ( -70.04,  -1.69)    1.51                 8
 04/18/2023   00:42:22   (  69.94, 165.79) 04/18/2023   00:41:13  (  69.93, 165.81)    0.86                69
 04/20/2023   15:17:46   (  70.13, -53.35) 04/20/2023   15:18:41  (  70.15, -53.28)    3.18                55
 04/20/2023   16:08:27   ( -69.99, 114.19) 04/20/2023   16:08:12  ( -69.98, 114.12)    2.85                15
 04/20/2023   16:58:58   (  69.19, -77.34) 04/20/2023   16:57:50  (  69.26, -79.21)   74.11                68
 04/23/2023   07:34:35   (  70.09,  62.51) 04/23/2023   07:35:06  (  70.11,  62.56)    2.80                31
 04/23/2023   08:25:17   ( -70.00,-130.03) 04/23/2023   08:24:36  ( -70.00,-129.97)    2.65                41
 04/25/2023   23:00:47   ( -70.58,  10.22) 04/25/2023   23:01:57  ( -70.47,  11.34)   43.03                70
 04/25/2023   23:51:23   (  70.05, 178.35) 04/25/2023   23:51:30  (  70.03, 178.34)    2.85                 7
 04/26/2023   00:42:04   ( -69.91, -14.11) 04/26/2023   00:41:00  ( -69.92, -14.18)    2.75                64
 04/28/2023   15:17:28   ( -70.13, 126.71) 04/28/2023   15:18:26  ( -70.14, 126.76)    1.94                58
 04/28/2023   16:08:12   (  70.03, -65.83) 04/28/2023   16:07:53  (  70.02, -65.76)    2.52                19