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land_n degree_n latitude_n minute_n 5,380 5 11.8773 5 true
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ID Title Author Corrected Date of Publication (TCP Date of Publication) STC Words Pages
A26045 Speculum nauticum a looking glasse for sea-men : wherein they may behold a small instrument called the plain scale whereby all questions nautical and propositions astronomical are very easily and demonstratively wrought ... / by Iohn Aspley. Aspley, John. 1647 (1647) Wing A4011; ESTC R27669 26,980 68

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Longitudes and extend the other foote unto eight Leagues and two miles and four seconds then with that distance of the Compasses place the one foot at six degrees of that line and turne the other upward and it will extend unto fifty six leagues therefore open your Compasses to the distance of fifty six Leagues in the line of equall leagues and apply them from the point P upon the line F D parallell unto A B from F unto D then from the point D draw the line D A. cutting the Quadrant K C B in C so shall K C be the distance of the Rhombe from the South Westward which is just thirty three degrees forty five minutes from the South which is Southwest and by South the Rhombe desired CHAP. X. By the Latitude of two places and distance upon the Rhombe to finde the leagues sailed The Pole depressed three degrees thirty minutes the Rhombe the fourth from the Meridian IN the second Demonstration draw the line A E then from A raise the Perpendicular A C then opening the Compasses to the distance of the Radius placing one foot thereof in the Centre A and with the other draw the Quadrant B D E Then reduce your three degrees thirty minutes into leagues counting for every degree twentie Leagues and for thirty minutes ten Leagues so they make seventy Leagues then open your Compasses unto seventy degrees in the line of equall parts and place them upon the line A B C from A unto C then from C draw the line C F Parallell unto A E. Then in regard your Rhombe was the fourth from the South take foure of the eight points of the Compasse and place them upon the Quadrant from B unto D then from A by the point D draw the line A D F cutting the line C F in F. So shall the distance betwixt A and F bee the number of leagues upon the fourth Rhombe before you can either raise or depresse the Pole three degrees thirty minutes which is here found to be ninety nine Leagues CHAP. XI To finde the distance of any Island from you that you may discerne by two Stations knowing the point of the Compasse the Island beareth unto each of the Stations Suppose being at Sea you discover an Island bearing South-west of you which place let it be your first Station and seventy Leagues sayling South observing the Island to beare West of you which let be the second Station the demand is to finde the Island from both the Stations IN the second Demonstration let A be the first Station and upon the Centre A draw the quadrant A B D E then in regard you found the Island to beare South-west from you therfore take four of your eight points of Compasse and place them upon your Quadrant from E unto D then from the Centre A by the point D draw the Line A D F representing the visuall Line passing betwixt your sight and the Island being in the first Station Then sayling seventy leagues South which is from A your first Station unto C the second Station then observing the Island to beare West of you therefore from the point C the second Station draw the Line dem 2 C F parallell unto A E cutting the Line A D E in point F so shall the point F be the place of the Island desired and the distance A F is the distance of the Island from the first Station which is just ninety nine Leagues off the Line of equall parts And likewise the distance from C unto F is the distance of the Island from the second Station which is here found to be just seventy Leagues and by this manner of worke you may finde the distance of any Island from you which you may discerne either by Sea or Land CHAP. XII Sailing from the South Longitude of 60 degrees 51 minutes and from Latitude 25 degrees 24 min. 99 Leagues upon a South-west course the Latitude and Longitude of the second place is demanded IN the second Demonstration draw the Quadrant A B C D E as is formerly taught then in regard you sail South-west take foure points of the Compasse from your Scale place them from B unto D then by the point D draw the line A D F then place your ninety nine Leagues upon the Line A D F from A unto F so shall E be the place of your Ship Then from F draw the Line F C parallell unto A E cutting the line A B C in C so let the distance C A be Leagues that you have run South which is 70 Leagues or 3 deg. 30 min. which being added to the latitude from whence you departed makes sixty foure degrees and twenty one minutes for the Latitude of the second place then take the distance C F and apply it unto the Line of equall parts and you shall finde it likewise seventy Leagues then opening your Compasses unto the middle Latitude 62 degrees 36 minutes in the Line of Cordes and apply it unto the first Line of Longitudes you shall finde that nine leagues and 0 miles and 38 seconds doe alter a degree of longitude then placing one foot of your Compasses in the second line of longitudes at 9 leagues and thirty eight seconds and extend the other to one then keeping the distance of the Compasses set one foot in the seventy leagues of the same line and the other foot will extend unto 7 degrees 37 min. which being substracted from the longitude from whence you departed leaves seventeen degrees and forty seven minutes for the Longitude of the second place CHAP. XIII A Ship sayling from the North Parallell of fifty degrees having an hundred Leagues to saile South-west and by West by the way is inforced by contrary windes to saile upon severall points of the Compasse first sayling thirty leagues upon a direct course then West North-west twenty Leagues then South sixty Leagues the question is to finde the Latitude of the second place how farre it is to the place whereunto you are bound the distance of the Rhombe that is betwixt them the distance that you are from your first Meridian and thereby the difference of Longitude IN the third Demonstration draw the Line A D and from the point A raise the perpendicular A B then open your Compasses unto the Radius of your Scale and place one foot therof in the centre A with the other draw the Quadrant B C D then take three points of the Compasses and and place them upon the Quadrant from D unto C then from the Centre A by the point C draw the line ACL 100 Leagues in length which is the true course you are to saile Then in regard you sayled 30 leagues direct take thirty degrees from your Scale of equall parts and place them upon the line AEC extending from A unto E then in regard you turned your Course West Northwest from the Centre E draw the Line EG parallel unto AD and againe from the Centre E draw the