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

The ecliptic is the apparent path of the Sun across the sky, which is mapped onto the celestial sphere.


Another word for one micrometre, which is written scientifically as 10^–6m or µm.


When a planet or moon appears at 50 per cent phase (half lit). As viewed from Earth, Mercury, Venus and the Moon can reach dichotomy.

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