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Religion and science

Cosmology: many stories, one changing sky.

A careful guide to ancient cosmologies, biblical and Qur'anic interpretation, modern astronomy, and the evidence that describes Earth as an oblate sphere.

Earth viewed from space against a dark sky
A definition

What does cosmology study?

Cosmology examines the origin, structure and development of the universe. It includes questions about Earth, the Sun, Moon, planets and stars, as well as the age and evolution of the cosmos.

Cosmology can be approached through religious story, philosophical reasoning, observation and mathematical science. These approaches often ask different kinds of questions, so comparing them requires care rather than treating every account as a scientific model.

This page summarizes historical viewpoints for educational comparison. A tradition's sacred language may be symbolic, poetic, theological or interpreted literally in different communities.
Historical overview

Five ways people have pictured the cosmos

Ideas about Earth's place in the universe have changed as religious interpretation, philosophy and observation developed.

Ancient and pre-scientific pictures

Several ancient Mediterranean and Near Eastern traditions imagined a compact cosmos with Earth below a structured sky. Images of waters above, heavenly realms and celestial movement served religious and cultural purposes.

Earth-centered astronomy

Greek thinkers developed geometric models in which a spherical Earth stood at the center of nested celestial spheres. Later scholars refined these models to predict planetary motion.

Islamic interpretation

Muslim commentators have read Qur'anic references to the heavens, Earth and celestial movement in varied ways. Some interpretations have supported a spherical Earth, while others emphasize theological meaning rather than physical description.

Modern scientific account

Evidence from geodesy, navigation, astronomy and spaceflight describes Earth as an oblate spheroid: nearly spherical, with a modest equatorial bulge. Earth rotates and orbits the Sun.

Contemporary flat-Earth claims

Some modern groups reject the scientific account and propose a disk-shaped Earth or a covering dome. These claims conflict with multiple independent observations, including satellite measurements, time zones and orbital mechanics.

What the evidence shows

Earth is nearly spherical

Earth is not a perfect sphere. Its rotation produces a slight widening at the equator, making the more precise description an oblate spheroid. Measurements of its size, gravity and shape are consistent across independent scientific methods.

Useful reference points

  • The equatorial radius is about 6,378 kilometres; the polar radius is about 6,357 kilometres.
  • Earth rotates once approximately every day and completes one orbit around the Sun in about 365.24 days.
  • The changing visibility of stars with latitude, global time zones, lunar eclipses and long-distance navigation all provide observations consistent with a curved Earth.
  • Modern astronomy places the Sun in the Milky Way, a galaxy containing vast numbers of stars, within a much larger universe of galaxies.

One familiar demonstration is the changing view of a ship as it moves beyond the horizon: the lower part disappears before the mast. No single demonstration carries the whole argument, but many observations converge on the same conclusion.

Reader guide

Questions about this page

Does this essay treat religious cosmology as science?

No. It distinguishes theological and symbolic claims from models tested through observation and measurement, while recognizing that religious texts are interpreted in more than one way.

Is Earth a perfect sphere?

No. Earth is best described as an oblate spheroid, with a small equatorial bulge caused by rotation.

Why include flat-Earth claims?

They are included as a contemporary belief movement so readers can compare its claims with observations and established scientific explanations.

What does the Bible say about cosmology?

Biblical passages use varied genres and imagery. Their interpretation differs among Jewish and Christian communities, so the related essays present context rather than one mandatory reading.

Do Qur'anic passages have one cosmological interpretation?

No. Muslim scholars and readers have offered different interpretations, including readings that emphasize language, metaphor, theology or compatibility with a spherical Earth.

Where can I explore religion and science more broadly?

Visit the religion and science section for related topics and comparisons.