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Research draft

day of the week

vr.tr.day-of-the-week · XCT.TME

Let an agent explain the day of the week, relay the seven-day cycle, standards, cultural and religious variation and calculation from calendar and cultural sources, and distinguish days of the week from dates, weekdays versus weekends, working days and named feast days.

Thing Registry Cross-cutting context

Research draft, second pass

A second pass drafted this model: the structure a model of this thing needs, and what is known about it in the world. The line under this one says how the second half was obtained - researched against sources, or recalled without web access, in which case nothing here was read anywhere and every claim is a lead to verify. Unreviewed either way.

written by Claude from model knowledge without web access - no source was read, every claim is a lead to verify

Researched by: Claude

Purpose and description

Let an agent explain the day of the week, relay the seven-day cycle, standards, cultural and religious variation and calculation from calendar and cultural sources, and distinguish days of the week from dates, weekdays versus weekends, working days and named feast days.

One of the seven named divisions of the week, Monday through Sunday, a recurring time interval used across calendars for scheduling work, worship and rest, with the seven-day week having roots in Babylonian astronomy and the Abrahamic religious tradition; ISO 8601 treats Monday as the first day, while many countries and religions treat Sunday or Saturday as the first or as a rest day. Day-of-week naming differs by language, often after classical planets or numbers, and algorithms such as Zeller s congruence and Sakamoto s method compute the weekday of any date.

What it is for: Dividing and scheduling the week.

It can be explain the cycle and standards; relay cultural and religious variation; relay calculation methods; distinguish related concepts.

Distinguishing features

Seven-day cycle

Recurring

Cultural first-day variation

Computable from dates

What it looks like

Not a physical object; labels on calendars and schedules.

Physical character

days in a week: 7 count

ISO 8601 first day: Monday note

planetary naming: Sun, Moon and five planets note - in many languages

How it is recognised

A named division of the seven-day week

Day of the week

Dates are calendar points; weekdays exclude the weekend; working days depend on rules; feast days are specific observances

Related models

is a kind of - in registry terms

time interval

is part of -

week

is contrasted with -

date

is contrasted with -

weekend

In practice

Families and kinds

weekdays

weekend days

rest days

named days

Standards and regulation

ISO 8601 week and day numbering

National working time and rest-day laws

Failure modes and hazards

First-day-of-week confusion in software

Assuming a universal rest day

Locale scheduling errors

Where this came from

wikidata · CC0 1.0

Source repository Registry entry point

Also registered as vr.tr.day-of-the-week

Drafted structure

Bundle to layer to finding to question, as the second pass will find it: 4 bundles · 8 layers · 8 findings · 16 questions.

Understand What a day of the week is.

Definition.

Definition

Definition.

Definition

Definition.

  1. What is a day of the week, and how does it differ from dates, weekdays and weekends, working days and feast days? definition
  2. Is the question about scheduling across locales, where the first day and rest days vary? boundary

Cycle

The seven-day cycle.

Cycle

Cycle.

  1. Why does the week have seven days? definition
  2. Which entry fits week? action
History History.

Sources.

Origins

Origins.

Origins

Origins.

  1. How did the seven-day week arise from Babylonian and religious traditions? provenance
  2. Which references are standard? provenance

Naming

Day names.

Naming

Naming.

  1. How are weekdays named after planets and gods in different languages? provenance
  2. Which sources are cited? provenance
Standards Standards.

Regulation.

ISO

ISO 8601.

ISO

ISO.

  1. How does ISO 8601 number days and weeks? provenance
  2. Which entry fits ISO 8601? action

First day

First day of the week.

First day

First day.

  1. Which countries treat Sunday, Monday or Saturday as the first day? provenance
  2. Is the information current? boundary
Context Calculation.

Science.

Algorithms

Weekday algorithms.

Algorithms

Algorithms.

  1. How do Zeller s congruence and similar methods find the weekday of a date? measurement
  2. Which entry fits Zeller s congruence? action

Religion

Sabbath and rest days.

Religion

Religion.

  1. How do Sabbath and Friday prayers shape rest days, with traditions attributed? provenance
  2. Is the presentation neutral and attributed? boundary

What the second pass must settle

  • Should each day be a separate entry?
  • How should locale first-day settings be linked?
  • How should weekday algorithms be documented?
Draft as JSON