Abstract
Observations of Aql X-1 (3U 1908 + 00) with the Ariel V Sky Survey Instrument during the decay of the 1975 June X-ray flare (first reported by Buff), indicate a modulation with a period of |$1\cdot30\pm0\cdot04$| days, JD of phase zero |$2442593\cdot63\pm0\cdot15$|⁠.

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