Wikidata:Property proposal/Angular size

angular diameter

Originally proposed at Wikidata:Property proposal/Natural science

Done: angular diameter (P5348) (Talk and documentation)

Description	angular measurement describing how large a sphere or circle appears from a given point of view
Represents	angular diameter (Q718647)
Data type	Quantity
Template parameter	i.e. size_v in infobox_galaxy
Domain	astronomy (Q333)
Example	Sun (Q525) -> 31.6–32.7 minutes of arc
Planned use	Harvest templates from astronomical objects
See also	angular distance (P2212), diameter (P2386)

Motivation

Making better automatic infoboxes, with more complete data. Theklan (talk) 07:31, 10 June 2018 (UTC)[reply]

Discussion

Support ArthurPSmith (talk) 15:26, 11 June 2018 (UTC)[reply]
Question I think it's better to stick with "angular diameter" as that's more clearly defined than "angular size". However, that only works with circular astronomical objects, we also need some way to handle elliptical objects, and irregular ones. We also need to define the wavelength that the size is measured at, but that can be done by qualifiers. Thanks. Mike Peel (talk) 01:33, 12 June 2018 (UTC)[reply]
Support David (talk) 16:20, 14 June 2018 (UTC)[reply]
Question Is the value of this property a range? If so, how do you plan to represent range in Wikidata datatype? Strings, such as "31.6–32.7", are not good because it is difficult to get the maximum and minimum value of the range from such strings. I think dummy value solution I proposed in other property proposal will be useful in this situation. --Okkn (talk) 18:47, 18 June 2018 (UTC)[reply]
- @Okkn: Wikidata quantity values automatically consist of a range (see [1]) with an "amount", "upper bound" and "lower bound". ArthurPSmith (talk) 17:52, 19 June 2018 (UTC)[reply]
  - @ArthurPSmith: I know the implemented range, but that is not suitable for representing a range whose average doesn't make sense. In this case, if we say
    ⟨ Sun (Q525)    ⟩ angular diameter (P5348) ⟨ 32.15±0.55 ⟩
    , instead of "31.6-32.7", that will give rise to a misunderstanding that "32.15" is the true value for the "angular diameter" of Sun (Q525). On the other hand, if we use dummy values and stored maximum and minimum values in qualifiers, we can automatically replace them when in the future Wikibase natively supports such range data type. --Okkn (talk) 02:06, 20 June 2018 (UTC)[reply]

@ديفيد عادل وهبة خليل 2, ArthurPSmith, Mike Peel, Okkn, Theklan: Done: angular diameter (P5348). − Pintoch (talk) 12:36, 20 June 2018 (UTC)[reply]