Epoch is the seventh parameter of an orbit: it is necessary to define an orbit. In this proposal I'd like to discuss:
- we need a new property (this) or we can use point in time (P585)?
- epoch refers to 6 orbital parameters: how to join them?
- for spaceflights and artificial satellites the epoch is expressed in usual calendar unity; for extrasolar planet in Julian day or some its variants. How to solve it?
Paperoastro (talk) 12:32, 25 October 2013 (UTC)
- Support It might be useful to have a specific property because it can be further developed to have customisations and different representations (J2000, TT, etc.). As for bundling orbit parameters, one possible solution is to have an item to represent the orbit and link it with a property "orbit parameters". --Micru (talk) 20:37, 12 November 2013 (UTC)
- I am not an astronomer and having read the en:Epoch (astronomy) article I am still confused.
- On the one hand epoch refers in some way to unusual ways for expressing calendar dates - for these we could use the current wikidata time variable type and ask the devs to offer alternative ways of displaying this at some future date
- on the other hand it seems to refer to unusual units of time (Julian years and Julian days) - for these we can use seconds until the devs get round to creating alternative units of time
- on the third hand it refers to IAU standards - we can create items for these
- What have I misunderstood? Filceolaire (talk) 13:28, 3 June 2014 (UTC)