Astronomy for Beginners

Here’s where you’ll find observing guides, how-to articles and great astronomy hints and tips. Don’t forget to also check out our comprehensive astronomy dictionary.

Astronomy Dictionary
Hydrogen-alpha filter

A type of optical filter that’s used for observing the Sun. It blocks all wavelengths of light except for a very narrow portion at 656.3nm.

Perihelion

The point in the orbit of an object that takes it closest to the Sun.

Solar wind

An emission of charged particles moving at supersonic velocities away from the surface of the Sun.

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