Glossary
Simple definitions for astronomy and Stellara terms
ISS
The International Space Station, a spacecraft orbiting Earth that can be visible from the ground during some passes.
APOD
Astronomy Picture of the Day, a daily NASA astronomy image/video with explanation.
Seeing
How stable the atmosphere is. Better seeing means steadier, sharper telescope views.
Transparency
How clear the sky is for deep-sky observing. Haze and humidity reduce transparency.
Moon Phase
The current illuminated shape of the Moon as seen from Earth.
Sky Brightness (mag/arcsec^2)
A measure of night-sky brightness at zenith. Higher values generally mean darker skies.
Bortle (Approx.)
A rough guide to light pollution level. In Stellara it is shown as an approximation from atlas data.
TLE
Two-Line Element data used to calculate a satellite orbit, including ISS tracking.
AI Assistant
Stellara's built-in assistant for astronomy questions, based on your context and current conditions.