. Memoirs of the American Academy of Arts and Sciences. og tan 8 n log sin 2 qlog cos 2 q n n Refraction Correction. In Right Ascension, Equation (23). In Declination, Equation (20). tan ^ sin 2 ga. 0. (15 COS 8) « tan=^cos2? + {d<-d) A(a-<z) w A (8-8) + It can be seen by inspection that, on account of small cleclination andmoderate motion, the corrections for curvature and proper motions must be in-significant ; also, that the refraction correction must be very small; the latteris computed,

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. Memoirs of the American Academy of Arts and Sciences. og tan 8 n log sin 2 qlog cos 2 q n n Refraction Correction. In Right Ascension, Equation (23). In Declination, Equation (20). tan ^ sin 2 ga. 0. (15 COS 8) « tan=^cos2? + {d<-d) A(a-<z) w A (8-8) + It can be seen by inspection that, on account of small cleclination andmoderate motion, the corrections for curvature and proper motions must be in-significant ; also, that the refraction correction must be very small; the latteris computed, however, to illustrate the special formula (23) for the case ofadjustment to apparent motion. Value of Diagonal, Equations (33) and (35). <.-«o. Sam. Equation (33) < ?log ()?V^ cos 8 // Equation (35) - —gp^^v^ 1 -gK 9 = VOL. XI. 23 MEMOIRS OF THE AMERICAN ACADEMY OF ARTS AND CENTENNIAL VOLUME. Vol. XL—Part IV.—No. IV CAMBRIDGE:JOHN WILSON AND SON. Onibctsttn ^

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