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We report a measurement of limb darkening of a solar-like star in the veryhigh magnification microlensing event MOA 2002-BLG-33. A 15 hour deviation fromthe light curve profile expected for a single lens was monitored intensively inV and I passbands by five telescopes spanning the globe. Our modelling of thelight curve showed the lens to be a close binary system whose centre-of-masspassed almost directly in front of the source star. The source star wasidentified as an F8-G2 main sequence turn-off star. The measured stellarprofiles agree with current stellar atmosphere theory to within ~4% in twopassbands. The effective angular resolution of the measurements is <1micro-arcsec. These are the first limb darkening measurements obtained bymicrolensing for a Solar-like star.

Probing the atmosphere of a solar-like star by galactic microlensing at high magnification