Category

Amateur astronomy

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amateur astronomy

hobby whose participants enjoy watching the sky

Bortle Dark-Sky Scale

scale of night sky brightness

Sky & Telescope

scientific journal

Sidewalk astronomy

Messier marathon

astronomy competition

amateur telescope making

activity of building telescopes as a hobby

American magazine

Foucault knife-edge test

optical test for curved mirrors

Antoniadi scale

weather conditions categorization system

Israeli Astronomical Association

Cherry Springs State Park

state park in the US

Edgar Wilson Award

American annual award for amateur astronomers involved in identifying comets (1998-)

public observatory

astronomical observatory mainly dedicated to public and educational purposes

thumb|LRGB Photo of the Eagle Nebula. LRGB, short for Luminance, Red, Green and Blue, is a photographic technique used in amateur astronomy for producing good quality color photographs by combining a high-quality black-and-white image with a lower-quality color image.thumb|left|Deep View of the Large and Small Magellanic Clouds captured using the LRGB method.In astrophotography, it is easier and cheaper to obtain good quality, high signal-to-noise ratio images in black and white. The LRGB method is used to work around this to get good color images. The color (chrominance) information from the