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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1766 Excerpt: ...III. of Refraction is only to be used, where both Altitudes are atove 5o. In this Casse, and this Cass e only, Tables III. adtV. SiippTernenTal are...
This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1766 Excerpt: ...III. of Refraction is only to be used, where both Altitudes are atove 5o. In this Casse, and this Cass e only, Tables III. adtV. SiippTernenTal are to be used for correcting Table III. ol Refraction, Enter Table III. Supplemental with leffer Al titude of the Moon or Star at the Top, and greater Altitude on the Side, and take out the corresponding Number; with which enter Table IV. Supplemental on the Side, and entering the fame Table with the Distance on the Top, the corresponding Number of Seconds is the Correction to be added to Table III. of Refraction. ':...',. The two last Tables, or V. and VI. Supplemental, serve for correcting the observed Distance of the Moon from the Sun, on account of the Sun's Parallax; their joint Efsect cannot exceed 9". Enter Table V. Supplemental with the Mocn's Altitude on the Side, and the Distance at the Top; and enter Table VI. Supplemental with the Sun's Altitude on the Side, and Distance at the Top. The two Numbers so taken out, applied with their proper Signs respectively, according to the Directions indicated by the Tables, to the Distance already corrected by the preceding Tables and Rules, give the Distance surther corrected on account of the Sun's Parallax. Here follow the four Examples wrought before, according to the four principal Tables, corrected by the supplemental Tables.., Example I. corrected. The greater Altitude, namely that of the Star, being 24. 48', and the Distance 5I50, the Correction of Table II. Supplemental is o; the leffer Altitude, namely of the Moon, being 120. 30', and the Distance 5I50, Table II. Supplemental also gives o; so that the Number found by Table II. cf Refraction, and consequently the.Effect of Refraction, as found before, appears to be exact, without needing any surthe...
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