what is the {start time} for {Tycho Brahe} has {work location} as {Uraniborg} ?
On which date did Tycho Brahe started working in Uraniborg?
When did Tycho Brahe start working in Uraniborg?
SELECT ?x WHERE { resource:Tycho_Brahe property:work_location ?a . ?a property:start_time ?x . ?a property:work_location resource:Uranienburg }
select distinct ?value  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q36620> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P937> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> <http://wikidata.dbpedia.org/resource/Q79220> .
?statement <http://www.wikidata.org/entity/P580> ?value. 
} 

SELECT ?value WHERE { wd:Q36620 p:P937 ?s . ?s ps:P937 wd:Q79220 . ?s pq:P580 ?value}