Question: What is the measure of the observable dimension of solar radius, or L?
Paraphrase: What is the degree of the perceptible measurement of sun oriented span, or L?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q48440 wdt:P111 ?answer . ?answer wdt:P4020 ?x FILTER(contains(?x , 'L'))}
Answer: distance