## An Epitome of Navigation and Nautical Astronomy, with Improved Lunar Tables, the Questions Arranged to the Nautical Almanac for 1852 |

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### Common terms and phrases

Altitudes and Horizontal Apparent Altitude azimuth Cape celestial centre chronometer circle Co-secant Co-sine Co-tang compass correction decimal degrees difference of latitude difference of longitude Dist Dep Dist Lat earth ecliptic equal equator Examples for Exercise feet find the diff find the latitude fixed star given Greenwich date Greenwich mean H.Ang height hour angle index error island latitude and longitude Logarithmic Sines longitude by chronometer mean time Greenwich meridian altitude miles minutes moon Moon's Horizontal Parallax Nautical Almanac noon observed altitude orbit P.M. at ship Parallel Sailing perp perpendicular Plane Sailing planet polar distance pole PROPORTIONAL LOGARITHMS refraction remainder required the latitude right angles right ascension sails Secant semd semidiameter sextant ship from latitude square subtract Sun or Star sun's declination Tangent Traverse Table triangle true altitude

### Popular passages

Page 29 - To draw a straight line at right angles to a given straight line, from a given point in the same.

Page 15 - LET it be granted that a straight line may be drawn from any one point to any other point.

Page 4 - An improper fraction is one in which the numerator is equal to or greater than the denominator, such as ^ , ^ , or ^ . 4.

Page 19 - All the interior angles of any rectilineal figure, together with four right angles, are equal to twice as many right angles as the figure has sides.

Page 197 - Moon and certain heavenly bodies, euch as they would appear to an observer at the centre of the Earth. When a Lunar Distance has been observed on the surface of the Earth, and reduced to the centre, by clearing it of the effects of parallax and refraction, the numbers in...

Page 15 - When equals are taken from unequals, the remainders are unequal. 6. Things which are double of the same thing, or equal things, are equal to each other.

Page 12 - When a straight line standing on another straight line makes the adjacent angles equal to one another, each of the angles is called a right angle; and the straight line which stands on the other is called a perpendicular to it.

Page 274 - To find the logarithm of a number consisting of more than four figures; Take out the logarithm of two numbers, one greater, and the other less, than the number proposed : Find the differ'ence of the two numbers, and the difference of their logarithms : Take also the difference between the least of the two numbers, and the proposed number. Then say, As the difference of...

Page 9 - Then multiply the second and third terms together, and divide the product by the first term: the quotient will be the fourth term, or answer.

Page 250 - J^C • hand semicircle would receive the wind at first about east by north ; but it would soon veer to east, as the storm passes onwards. The ship which falls into the left-hand semicircle would at first receive the wind at north-east; but with this latter ship, instead of veering towards east, it would veer towards north. The explanation of the rule will best be made out by attentively inspecting the two figures. In both, the black ships are on the proper tacks; the white ships being on the wrong...