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Led by Nicolaus Copernicus
Module 7 of Edexcel GCSE Astronomy. Led by Nicolaus Copernicus — the canon who quietly dispatched fourteen centuries of geocentric cosmology with a single 1543 manuscript. The student traces how ancient civilisations observed and modelled the Solar System, why epicycles were necessary, and how the AU, light year, and parsec express distances at solar and stellar scales.
Led by Nicolaus Copernicus
The question
How did civilisations across the ancient world observe and model the heavens — for agriculture, religion, calendars, and monumental alignment — and why are the alignments they encoded into stone now subtly wrong? How did the Ptolemaic geocentric system describe planetary motion accurately enough to survive for fourteen hundred years despite being physically incorrect? And what units do astronomers use to express the scale of the Solar System and the distances to nearby stars? The spec covers archaeoastronomy, the precession-driven drift of ancient alignments, geocentric modelling and the role of epicycles, and the AU/light year/parsec hierarchy.
Outcome
the student can describe four uses of ancient astronomical observation, account for the precession-driven drift of monument alignments, describe geocentric models including Ptolemy's epicycle system, explain why epicycles were mathematically advantageous despite being physically wrong, and define and apply the AU, light year, and parsec. *(Edexcel 1AS0 Paper 1 — Topic 7, spec points 7.1–7.6)*
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