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Topic 6: Celestial observation

3 dot points across 3 inquiry questions. Click any dot point for a focused answer with worked past exam questions where available.

Why do some stars never set, and how can Polaris tell you your latitude?

The diurnal motion of the sky, circumpolar stars and how to tell whether a star is circumpolar, upper and lower transit (culmination), and finding latitude from Polaris.
A focused answer to Edexcel GCSE Astronomy statements 6.13 to 6.18, covering the diurnal motion of the sky due to the Earth's rotation, circumpolar stars and the declination test for circumpolarity, upper and lower transit (culmination), and how to find an observer's latitude from the altitude of Polaris.
10 min answer →

What can you see in the night sky with the naked eye, and how do you observe it well?

Recognising naked-eye phenomena and constellations, using asterisms as pointers, the effects of light pollution, naked-eye observing techniques, and the appearance of the Milky Way.
A focused answer to Edexcel GCSE Astronomy statements 6.1 to 6.6 and 6.19 to 6.21, covering the naked-eye astronomical phenomena and constellations, using asterisms as pointers, the causes and effects of light pollution, naked-eye techniques such as dark adaptation and averted vision, the factors affecting visibility, and the appearance of the Milky Way.
10 min answer →

How do astronomers give a fixed address to a star, and a local position in our sky?

The celestial sphere, poles and equator, the equatorial coordinate system (right ascension and declination), the horizon coordinate system (altitude and azimuth), and hour angle and local sidereal time.
A focused answer to Edexcel GCSE Astronomy statements 6.7 to 6.12, covering the celestial sphere, poles and equator, the equatorial coordinate system (right ascension and declination), the horizon coordinate system (altitude and azimuth), and how an observer's latitude and meridian link them through hour angle and local sidereal time.
10 min answer →