This page shows a weather forecast for the next 7 days, and the seeing conditions for tonight. In astronomy, seeing refers to the atmospheric conditions that affect the clarity and stability of celestial objects, particularly stars. It is caused by turbulence in the Earth's atmosphere, which causes the starlight to twinkle or shimmer, an undesirable effect in astronomy. Telescopes offer clearer views in good seeing conditions, with lower arc sec values indicating better seeing. To combat poor seeing, modern ground-based telescopes employ adaptive optics. Of course, space telescopes like Hubble and James Webb, being outside the atmosphere, are not affected by seeing.