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

A transit is when a celestial body passes in front of another body that is of a greater apparent diameter than itself. This could be, for example, one of Jupiter’s moons passing in front of Jupiter’s disc.

Radial velocity method

A way of searching for exoplanets by looking at the movement of spectral lines in a star’s light to infer the presence of a planet.


An imaginary line that circles the Earth from north to south that marks the point at which the Sun is at its highest. Anti- and post-meridian (am and pm), mark the times before and after the Sun crosses the Meridian at midday, respectively.

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