Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 5 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2023   20:40:03   (  -0.00,-104.72) (   0.00,-109.02)  478.11                 0
 05/21/2023   20:22:23   (  -0.00,-104.72) (   0.07,-104.28)   49.62                80
 05/24/2023   08:25:27   (  -0.01,-104.72) (   0.08,-105.03)   35.49                80
 05/25/2023   08:04:02   (  -0.01,-104.72) (  -0.94,-100.50)  480.41                80
 05/26/2023   20:26:00   (   0.01,-104.71) (  -0.21,-105.81)  125.05                80
 05/27/2023   20:09:55   (   0.02,-104.71) (   0.80,-101.29)  391.37                80
 05/29/2023   08:31:42   (  -0.02,-104.72) (   0.40,-106.55)  208.52                80
 05/30/2023   08:10:18   (  -0.02,-104.72) (  -0.62,-102.02)  307.69                80
 05/31/2023   20:32:14   (   0.02,-104.72) (  -0.58,-107.33)  298.03                80
 06/01/2023   20:16:10   (   0.02,-104.72) (   0.45,-102.80)  218.30                80
 06/03/2023   08:37:58   (  -0.03,-104.73) (   0.69,-108.08)  381.60                80