## The Practical Navigator, and Seaman's New Daily Assistant: Being an Epitome of Navigation: Including the Different Methods of Working the Lunar Observations. With Every Particular Requisite for Keeping a Complete Journal at Sea ... To this Edition are Added ... the Requisite Tables Used with the Nautical Almanac in Determining the Longitude at Sea ... |

### Inni boken

Side 41

This Circle is called Equator,

Year, viz. about the 21st of March, at his Entrance into Aries, and again into Libra

about the 23d of September; then, making equal Day and Night throughout the ...

This Circle is called Equator,

**because**when the Sun comes to it, which is twice aYear, viz. about the 21st of March, at his Entrance into Aries, and again into Libra

about the 23d of September; then, making equal Day and Night throughout the ...

Side 133

... find in passing between the Coasts of Guinea and Brazil, notwithstanding the

Width of this Sea is more than 500 Leagues: This happens

Winds at that Time of the Year commonly extend some Degrees beyond the

ordinary ...

... find in passing between the Coasts of Guinea and Brazil, notwithstanding the

Width of this Sea is more than 500 Leagues: This happens

**because**the S. E.Winds at that Time of the Year commonly extend some Degrees beyond the

ordinary ...

Side 158

... and is to be counted from the East towards the North,

Rising, and the Declination is North; that is, E. 22°20'N, - But when the Latitude is

given in Degrees, and the Declination in Degrees and Minutes, find the Declin, ...

... and is to be counted from the East towards the North,

**because**it is at the Sun'sRising, and the Declination is North; that is, E. 22°20'N, - But when the Latitude is

given in Degrees, and the Declination in Degrees and Minutes, find the Declin, ...

Side 164

N, 8 ;oW 41 18 E. Sum is the Variation Which is Easterly,

Azimuth is to the Right of the Observed. ExAMP Le V. Suppose the Sun's true

Azimuth in the Forenoon is N. 86°40' Easterly, but by the Compass it is N. 73° 24'

Easterly ...

N, 8 ;oW 41 18 E. Sum is the Variation Which is Easterly,

**because**the trueAzimuth is to the Right of the Observed. ExAMP Le V. Suppose the Sun's true

Azimuth in the Forenoon is N. 86°40' Easterly, but by the Compass it is N. 73° 24'

Easterly ...

Side

Suppose on September 10, 1796, a Ship in Longitude 64 Degrees West of

London; what is the Sun's true Declination when on the Ship's Meridian - - - D. M.

And

N.

Suppose on September 10, 1796, a Ship in Longitude 64 Degrees West of

London; what is the Sun's true Declination when on the Ship's Meridian - - - D. M.

And

**because**the Declin. is decreasing the Decli. at London Sept. 10, 1796, 4 35N.

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### Vanlige uttrykk og setninger

againſt alſo Altitude Anchor Angle Arch Azimuth Baſe becauſe beſt Cape Caſe Co-fine Co-ſecant Co-tang Coaſt Column Compaſs Correótion Courſe and Diſtance Declination Degrees Diff of Lat Difference of Latitude Difference of Longitude Diſt ditto Diviſion E X A M P L E Eaſt Fathoms find the Difference firſt Funchal Glaſs haul High Water Hours Iſland Iſles laſt Latitude and Departure leſs Line of Numbers Line of Sines Logarithm Long meaſured Merid Meridian Meridian Altitude Middle Latitude Miles Moon Moon's moſt muſt neareſt Noon North Objećts Obſ Obſervation oppoſite Parallax paſſing Plane Sailing Point Radius 90 repreſent Right Aſcenſion Riſing ſails ſame Secant ſecond ſee ſet ſeveral ſhe ſhews Ship's ſhould Side Sine ſmall ſome South ſtands Star ſteer ſubtracted ſuch Sun's Suppoſe Table Tangent theſe thoſe Traverſe true uſed Weſt Weſterly Wind

### Populære avsnitt

Side 21 - The circumference of every circle is supposed to be divided into 360 equal parts, called degrees ; and each degree into 60 equal parts, called minutes ; and each minute into 60 equal parts, called seconds ; and these into thirds, etc.

Side 16 - EXAMPLE. If the diameter of a circle be 7 inches, and the circumference 22, what is the circumference of another circle, the diameter of which is 14 inches ? Extend from 7 to 22, that extent will reach from 14 to 44 the same way.

Side 34 - ... the sum of the segments of the base is to the sum of the sides as the difference of the sides to the difference of the segments of the base.

Side 15 - All fractions found in this line must be decimals ; and if they are not, they must be reduced into decimals, which is easily done by extending the compasses from the denominator to the numerator; that extent laid the same way, from 1 in the middle or right hand, will reach to the decimal required.

Side 267 - A figurative expression for the timbers. /fuie at anchor, is when a ship is held by her anchors, and is not driven by wind or tide. To ride athwart, is to ride with the ship's side to the tide. To ride hoirie fallen, is •when the water breaks into the hawse in a rough sea.

Side 155 - Complement of the Latitude Is to Radius, So is the Sine of the Sun or Star's Declination To the Sine of the true Amplitude ; Which is always of the fame Name with the Declination, whether North or South.

Side 124 - The most usual way of discovering the set and drift of an unknown current, is thus : Let three or four men take a boat a little way from the ship : and by a rope fastened to the boat's stern, let down a heavy iron pot or loaded kettle to the depth of 80 or 100 fathoms ; then heave the log, and the number of knots run out in half a minute will be the miles the current sets per hour, and the bearing of the log will show the set of it.

Side 16 - The solid content of any bale, box, chest, fcc. is found by extending from 1 to the breadth ; that extent will reach from the depth to a fourth number, and the extent from 1 to that fourth number will reach from the length to the solid content.

Side 209 - PM per watch, the altitude of the sun's lower limb was 28° 20' above the horizon of the sea, the eye being elevated 20 feet above the surface of the water, and the sun's bearing by compass S. by W. and at 2h. 58m. 2Gs. PM by watch, the altitude of the sun's lower limb was 16° 41...

Side 168 - A ship lying-to under her mainsail, with her starboard tacks aboard, comes up E. by S. and falls off NE by E. there being one point westerly variation, and she makes 5 points lee-way — what course does she make good ? The middle between E. by S. and NE by E. is E. by N. ; and by allowing 6 points to the left hand (viz.