March
Let an agent explain March as a calendar month, relay length, position, astronomy, etymology and common observances from calendar and cultural sources, and distinguish March from the March equinox, the verb and noun march, and months in other calendars, noting that observances vary by country and year.
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 March as a calendar month, relay length, position, astronomy, etymology and common observances from calendar and cultural sources, and distinguish March from the March equinox, the verb and noun march, and months in other calendars, noting that observances vary by country and year.
The third month of the year in the Julian and Gregorian calendars, with 31 days, running from day 60 to day 90 in common years and from day 61 to day 91 in leap years, named after the Roman god Mars and originally the first month of the early Roman calendar, containing the March equinox around 20 March, the start of astronomical spring in the Northern Hemisphere and autumn in the Southern Hemisphere; observances include International Women s Day on 8 March, St Patrick s Day on 17 March and Nowruz at the equinox, and the Ides of March on 15 March recall the assassination of Julius Caesar in 44 BC.
What it is for: Organising time within the year.
It can be explain position and length; relay astronomy and etymology; describe observances; distinguish related concepts.
Distinguishing features
Third month
Contains an equinox
Named after Mars
Former start of the Roman year
What it looks like
Not a visible object; a calendar period.
Physical character
days: 31 count
day of year range: 60-90 in common years, 61-91 in leap years note
equinox: around 20 March date - varies by year and time zone
ISO 8601 number: 03 code
How it is recognised
Third month of the Gregorian calendar
March, Mar
The March equinox is an astronomical event; march also means a walk or procession; other calendars differ
Related models
is a kind of - in registry terms
follows -
precedes -
contains -
In practice
Families and kinds
days of March
March observances
March in different hemispheres
Standards and regulation
ISO 8601 date representation
National public holiday laws
Daylight saving time rules
Failure modes and hazards
Assuming Northern Hemisphere seasons
Stating moveable observances as fixed
Confusing daylight saving start dates by region
Where this came from
wikidata · CC0 1.0
Also registered as vr.tr.march-group
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 March is.
Definition.
Definition
Definition.
Definition
Definition.
- What is March, and how does it relate to the March equinox, the word march and months in other calendars? definition
- Is the question about dates, seasons, holidays or etymology? boundary
Days
Days of March.
Days
Days.
- Which days of March have entries, and what day-of-year numbers do they have? measurement
- Which entry fits the specific day? action
Astronomy Astronomy and seasons.
Science.
Equinox
Equinox.
Equinox
Equinox.
- Why does the March equinox fall around 20 March? provenance
- Which references are standard? provenance
Clock changes
Daylight saving.
Clock changes
Clock changes.
- When do clocks change in March in Europe and North America? provenance
- Which sources are cited? provenance
Culture Observances.
Attribution.
Observances
Observances.
Observances
Observances.
- Which observances fall in March, such as International Women s Day, St Patrick s Day and Nowruz? provenance
- Which entry fits Nowruz? action
Ides
Ides of March.
Ides
Ides.
- What were the Ides of March and why are they remembered? provenance
- Which entry fits Ides of March? action
Context Calendar history.
Context.
Roman
Roman calendar.
Roman
Roman.
- Why was March once the first month of the Roman year? provenance
- Which entry fits Roman calendar? action
New year
Legal new year.
New year
New year.
- Why did England start the legal year on 25 March until 1752? provenance
- Which entry fits Lady Day? action
What the second pass must settle
- Should observances be linked individually?
- How should calendar sources be linked?
- How should moveable observances such as Easter be recorded?