Calendar

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The calendar is a way to reckon time, specifically the passage of days in relation to months and years. The choice of calendar determines when the anniversaries of events will take place. Hence, it determines when and how long their celebrations—the feasts and fasts—will be, and even whether those take place at all.

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Historical origins

The Church calendar

Main article: Church calendar.

The Paschal moon

Gregorian reforms

Main article: Gregorian Calendar.

Origins

Controversy

Adoption

The New Calendar

Main article: Revised Julian Calendar.

Origins

Controversy

Schism and persecutions

Astronomical appendix

The Ptolemaic model

The Copernican revolution

The Copernican model

The Keplerian model

Classical physics

The Newtonian model

The relativistic model

Perturbative models

Computational models

Isotropy and geocentrism

The isotropic principle

Coordinate systems

Cosmic microwave background radiation

Modeling limitations

Chaos theory

Computational effects

Geological effects

Other astrophysical effects

Conclusion: Apparent time in the heavens

References