Did you know the atmosphere isn’t uniform? When you look at a star near the horizon, its light passes through a thicker layer of air called a higher air mass.
This thicker atmosphere causes:
- Increased scattering: Blue and violet light scatter more, making low targets look redder, like a sunset.
- Reduced clarity: Dust, moisture, and turbulence blur the image.
- Atmospheric extinction: Overall brightness dims due to absorption and scattering.
Plus, turbulence near the ground causes stars to twinkle more and fine details to blur.
Bottom line: Observing targets as high as possible minimizes these effects and gives you sharper, brighter views.
