Proceeding westward along the north shore of the Strait, Baffin paid close attention to the tides and currents with a view to ascertain the direction of the passage, if it existed. Sighting Nottingham and Salisbury Islands the _Discovery_ came to a small new island which, owing to the noise caused by the grinding of the ice, received the name of Mill Island. It was on the 22nd June that Baffin took his memorable lunar observation for longitude. “While we were fast enclosed with ice, and the weather fair and clear, I saw both the sun and moon very clear. So I fitted my instruments to take both the almicanter and azimuth of the sun, and also of the moon.” He then describes a complete lunar observation. Not having an instrument with which he could measure so large an angle, he resorted to the method of measuring the distance, which was 104°, by the difference of azimuth[87]. The almicanters are small circles parallel to the horizon, and therefore the observed altitudes. This method of finding the longitude was first suggested by John Werner of Nuremberg in 1514, and again by Gemma Frisius in 1545. But Baffin’s observation is the first recorded attempt to take a lunar at sea. Baffin obtained the time of the moon being on the meridian at London from Searle’s ephemeris, and at Wittenberg from that of Origanus[88]. He took another observation for longitude by the method previously adopted by him in Cockayne Sound. Sir Edward Parry, when passing up the strait in 1821, was much interested in these very remarkable observations by Baffin. Sir Edward had seen the account in Purchas but not the manuscript, where the result given is still more accurate. As regards the study and practice of nautical astronomy, Baffin was undoubtedly a genius. Having completed the survey of the north side of the Hudson Strait, the _Discovery_ stood over to the eastern coast of Southampton Island, reaching a point which was given the name of Cape Comfort. Here the various signs were again watched for any evidence of a passage by the ice-laden sea to the north-west. Baffin’s conclusion that there is no passage by what is now called Frozen Strait was based on the increased quantity of ice, the water becoming less deep, and the sight of land bearing N.E. by E., circumstances which led him to suppose that he was at the entrance of a wide bay. He, therefore, relinquished the enterprise so far as this route was concerned. Sir Edward Parry felt a warm sympathy for the efforts of his distinguished predecessor, and in 1821 he named an island Baffin Island near Cape Comfort, “out of respect to the memory of that able and enterprising navigator.” He also named a headland on Southampton Island Cape Bylot, as being probably the westernmost point seen from the _Discovery_ in that July of 1615.