Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 20.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 04/21/2023   23:26:10   (  70.11,-175.42) 04/21/2023   23:26:45  (  70.10,-175.45)    1.25                35
 04/22/2023   00:16:52   ( -70.03,  -7.97) 04/22/2023   00:16:15  ( -69.99,  -7.97)    3.61                37
 04/24/2023   14:52:29   ( -70.92, 131.76) 04/24/2023   14:53:37  ( -70.81, 133.82)   76.09                68
 04/24/2023   15:42:59   (  70.08, -59.58) 04/24/2023   15:43:15  (  70.11, -59.58)    2.80                16
 04/24/2023   16:33:41   ( -69.99, 107.86) 04/24/2023   16:32:45  ( -70.00, 107.91)    1.65                56
 04/27/2023   07:09:06   ( -70.28,-111.41) 04/27/2023   07:10:18  ( -70.22,-111.20)   10.57                72
 04/27/2023   07:59:47   (  70.07,  56.23) 04/27/2023   07:59:45  (  70.05,  56.21)    1.74                 2
 04/27/2023   08:50:28   ( -69.92,-136.24) 04/27/2023   08:49:15  ( -69.95,-136.30)    3.49                73
 04/29/2023   23:25:52   ( -70.17,   4.55) 04/29/2023   23:26:48  ( -70.16,   4.59)    1.77                56
 04/30/2023   00:16:36   (  70.07, 172.02) 04/30/2023   00:16:15  (  70.05, 172.08)    2.72                21
 04/30/2023   01:07:05   ( -69.29, -19.52) 04/30/2023   01:05:56  ( -69.34, -21.25)   68.38                69
 05/02/2023   15:42:40   ( -70.13, 120.41) 05/02/2023   15:43:19  ( -70.11, 120.38)    2.35                39
 05/02/2023   16:33:24   (  70.03, -72.13) 05/02/2023   16:32:45  (  70.05, -72.06)    3.61                39