Astronomy › Section D · Earth, Moon, and sky › Topic D.1
Earth and sky coordinates
To find a city you need its latitude and longitude; to find a star you need its declination and right ascension. The two grids are built the same way, and knowing both tells you which stars you can see from where you stand.
In this topic
- A grid on a spinning ball
- Latitude and longitude
- Worked example: degrees into distance
- Declination: latitude on the sky
- Right ascension: longitude on the sky
- Worked example: converting right ascension
- Your latitude sets your sky
- Worked example: which stars never set?
- Proof that Earth turns
- Common mistakes to avoid
- Key takeaways
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