Abstract
ABSTRACT Cassini, in his observations of Nova Vul in 1671, repeatedly used β Lyr for brightness comparison, apparently without even suspecting that it was a variable star. An attempt was made to correlate Cassini's "indirect" observations of β Lyr with modern ephemeris formulae in order to find out whether he could have overlooked a primary eclipse. None of the modern ephemeris formulae would allow a reliable extrapolation of minimum epochs back to 1671, but the coverage of the light curve by the unintended observations suggests perhaps a modest chance that the 17th-century observers missed the variable near its primary minimum.
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