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TABLE VIII.

PARALLAX OF THE SUN ON THE FIRST DAY OF EACH MONTH, THE MEAN HORIZONTAL PARALLAX BEING 8"60.

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The Sun's Horizontal Parallax is also given for every ten days, in the Nautical Alma

nac, immediately before the ephemeris of the planets.

The Sun's Parallax in Altitude, for every degree, is given in the last of Dr. Pearson's "Solar Tables," vol. i. page 180.

TABLE IX.

REDUCTION OF THE MOON'S EQUATORIAL HORIZONTAL PARALLAX, TO THE HORIZONTAL PARALLAX IN ANY LATITUDE.

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The Moon's Horizontal Parallax, given in the third page of each month in the Nautical Almanac for noon and midnight, is the equatorial parallax for Greenwich mean noon and midnight; from thence it is to be deduced for the time and place of observation. The correction for latitude, on account of the spherical figure of the earth, is seldom thought of at sea, but can be made from the table above. Thus, supposing the hor. equat. par. to be 58'; the hor. par. in lat. 52° would be 58′ 7′′-2 = 57′ 52′′8.

This reduced hor. par. is to be farther corrected for altitude by means of tables for that purpose (see Pearson, vol. i. pages 188 to 196: and Riddle, pages 156* to 173); or by the following rule:-sin hor. par. X cos alt. sine par. in alt.

=

* Riddle's tables are for clearing the lunar distance, and the corrections are for both parallax and refraction.

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The Parallaxes and Semidiameters of the Planets are given in the Nautical Almanac.

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DIP OF THE SEA HORIZON AT DIFFERENT DISTANCES FROM IT.

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27 0-4 4.1 11.8 23.4 38.9 58.3 81.7
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29 0.5 4.3 121 23.8 39'5 59.0 82.5
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32 0.6 4.6 12.6 24.5 40'3 60°1 83.8
33 0-6 4.7 12.8 24-7 40'6 60.5
34 0.6 4.8 12.9 25.0 40'9 60'8
35 0.7 4.9 131 25.2 41°2 61.2
36 0.7 5.0 13.3 25.4 41.5 61.6
37 0-7 51 134 25.7 41'8 61.9
38 0.8 5.2 13'6 25.9 42'1 62.3
39 08 5.3 13.8 26.2 42'5
40 0-9 54 14.0 26.4 42'8 63'0 87.3
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Table XVII. of Mr. Baily extends to 36 minutes from the meridian.

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