What is {significant event} of {Buzz Aldrin} that is {start time} is {1969-7-21} ?
What important task did Buzz Aldrin begin on July 21, 1969?
What significant event for Buzz Aldrin began on July 21, 1969?
SELECT ?q WHERE { resource:Buzz_Aldrin property:significant_event ?m . FILTER ( CONTAINS ( YEAR ( ?g ) , '1969' ) ) . ?m property:start_time ?g . ?m property:significant_event ?q }
select distinct ?obj  where {
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#subject> <http://wikidata.dbpedia.org/resource/Q2252> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#predicate> <http://www.wikidata.org/entity/P793> .
?statement <http://www.w3.org/1999/02/22-rdf-syntax-ns#object> ?obj .
?statement <http://www.wikidata.org/entity/P580> <1969-7-21>
} 

SELECT ?obj WHERE { wd:Q2252 p:P793 ?s . ?s ps:P793 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1969')) }