Amazing Wikidata Timelines

Wikidata has timelines built into its queries. (See above for "People who died by burning")

First of all, this is incredible and amazing and insanely powerful.


Secondly, this means that a number of persnickety constraints must be respected for this tool to work.

What are these constraints?

The creation, in Wikidata, of "events".

Populated with all the appropriate information, like

Title	ID	Data type	Description	Examples	Inverse
location	P276	Item	location: location of the item, physical object or event is within. In case of an administrative entity use P131. In case of a distinct terrain feature use P706.	Bardo National Museum attack <location> Bardo National Museum	-
organizer	P664	Item	organizer: person or institution organizing an event	ATP World Tour <organizer> Association of Tennis Professionals	-
participant	P710	Item	person, group of people or organization (object) that actively takes/took part in the event (subject). Preferably qualify with "object has role" (P3831). Use P1923 for team participants.	2010 FIFA World Cup <participant> Denmark national football team	participant of
public holiday	P832	Item	public holiday: official public holiday that occurs in this place in its honor, usually a non-working day	Belarus <public holiday> Radonitsa	-
attendance	P1110	Quantity	number of people (spectators, ticket holders) at an event or exhibition	Berwick Run for the Diamonds <attendance> 1985	-
winner	P1346	Item	winner: winner of an event - do not use for wars or battles	2010 FIFA World Cup <winner> Spain national football team	victory and award received
number of missing	P1446	Quantity	number of people missing after an event - qualify with "point in time (P585)"	2013 Lushan earthquake <number of missing> 23	-
has immediate cause	P1478	Item	nearest, proximate thing that directly resulted in the subject as outcome or effect. Used in conjunction with 'has cause' (i.e. underlying cause) and 'has contributing factor'. See 'Help:Modeling causes'.	Cretaceous–Paleogene extinction event <has immediate cause> starvation and impact winter	immediate cause of
has contributing factor	P1479	Item	thing that significantly influenced, but did not directly cause, this outcome or effect. Used in conjunction with 'has cause' and 'has immediate cause'. See 'Help:Modeling causes'.	American Civil War <has contributing factor> caning of Charles Sumner	contributing factor of
end cause	P1534	Item	end cause: qualifier to use together with the end date qualifier (P582) to specify the cause	→ Property talk:P1534	-
used by	P1535	Item	user: item or concept that makes use of the subject (use sub-properties when appropriate)	remote control unit <used by> TV-watcher	uses
immediate cause of	P1536	Item	immediate cause of this effect	American Civil War <immediate cause of> assassination of Abraham Lincoln	has immediate cause
contributing factor of	P1537	Item	thing that is significantly influenced by this cause, but does not directly result from it. See 'Help:Modeling causes' for examples and discussion.	obesity <contributing factor of> heart disease	has contributing factor
frequency of event	P2257	Quantity	recurring: standard nominal interval between scheduled or regularly recurring events. Use with unit of time, sample: year (Q577).	Olympic Games <frequency of event> 4 year	-