. Memoirs of the American Academy of Arts and Sciences. i ^ MEMOIRS OP THE AMERICAN ACADEMY OF ARTS AND CENTENNIAL VOL U ME. Vol. XI.—Part III.—Nos. II., III. CAMBRIDGE:JOHN WILSON AND SON. aanibctsitg II. The Apparent Position of the Zodiacal AETHUE SEAELE. Presented October 14, 1SS5. In all the explanations of the zodiacal light which have at present any claimto serious consideration, it is assumed that the light is due to finely dividedmatter of some kind, illuminated either by direct sunlight or by the result ofelectrical or chemical action. This matter may
. Memoirs of the American Academy of Arts and Sciences. i ^ MEMOIRS OP THE AMERICAN ACADEMY OF ARTS AND CENTENNIAL VOL U ME. Vol. XI.—Part III.—Nos. II., III. CAMBRIDGE:JOHN WILSON AND SON. aanibctsitg II. The Apparent Position of the Zodiacal AETHUE SEAELE. Presented October 14, 1SS5. In all the explanations of the zodiacal light which have at present any claimto serious consideration, it is assumed that the light is due to finely dividedmatter of some kind, illuminated either by direct sunlight or by the result ofelectrical or chemical action. This matter may be only a portion of the atmos-phere, or of some cosmical mass more or less homogeneous. But in this casethe illumination is presumed to be confined within certain limits. The object,therefore, which observers of the zodiacal light have ordinarily proposed to them-selves has been the discovery of the position and extent of the matter thusilluminated. Its apparent position in the sky was accordingly first to be deter-mined at particular times, and large numbers of sketches, representing its visiblelimits,
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