Assertion: caster | /r/HasProperty | recorded as double star
Facets:
value: by james pound
type: OTHER
value: in 1718
type: TEMPORAL
Source sentences:
text: Appearing to the naked eye as a single star, Castor was first recorded as a double star in 1718 by James Pound, but it may have been resolved into at least two sources of light by Cassini as early as 1678.