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Topic: Celestial navigation

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In the News (Sat 25 May 19)

  Boating, Sailing, & Navigation DVDs
CELESTIAL NAVIGATION - The Air Almanac (H.O. After #D303, this program goes on to show how to shoot the 57 Navigational Stars, 4 Planets and Moon.
Buckley simply and clearly explains the theory and practice of Celestial Navigation and teaches the noon shot.
Includes clear demonstrations on the water and in a simulated navigator's station in a Coast Guard certified navigation school.
www.boatingvideos.com   (2347 words)

  Celestial navigation Summary
Celestial navigation, also known as astronavigation, is a position fixing technique that was the first system devised to help sailors cross the featureless oceans without having to rely on random chance to enable them to strike land.
Celestial navigation is the process whereby angles between objects in the sky (celestial objects) and the horizon are used to locate one’s position on the globe.
Modern practical navigators nearly always use celestial navigation in combination with satellite navigation to correct a dead-reckoning track, that is, a course estimated from a vessel's position, angle and speed.
www.bookrags.com /Celestial_navigation   (0 words)

Navigators could determine their latitude by measuring the sun's angle over the southern horizon at noon, and comparing that to the known angle at the same date at their home port.
In modern celestial navigation, a navigational almanac and trigonometric sight reduction tables permit navigators to measure the Sun, Moon, visible planets or any of 57 navigational stars at any time of day or night.
Automated navigation systems are almost all based on measuring the time-of-flight of radio waves using the well-known speed of light to measure distance from a number of points.
www.ebroadcast.com.au /lookup/encyclopedia/na/Navigation.html   (1515 words)

 Celestial navigation - Wikipedia, the free encyclopedia
Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on random chance to enable them to strike land.
Celestial navigation is the process whereby angles between objects in the sky (celestial objects) and the horizon are used to locate one’s position on the globe.
The celestial line of position concept was discovered in 1837 by Thomas Hubbard Sumner, and led later in the 19th century to the development of the modern intercept method of reducing sextant sights.
en.wikipedia.org /wiki/Celestial_navigation   (2330 words)

 Celestial Navigation
Celestial Navigation is the art and science of using celestial bodies such as the Sun, Moon, planets and stars to determine an observer's position on Earth.
Celestial axis and poles: The axis through the center of the celestial sphere perpendicular to the celestial equator is the celestial axis.
The declination of the celestial body (the body is denoted by star on Figure 4) is the arc of the body's meridian from the celestial equator to the place of the body on the sphere.
www.math.ubc.ca /~cass/courses/m308-02b/projects/jackson/Page1.html   (795 words)

 Navigator Light Software
The declination is measured in the plane North-South, from the Celestial Equator.
The celestial sphere poles, being in the axis of rotation, remain fixed in the sky.
Because both Earth and Celestial equators are in the same plane, the latitude of the GP is equal to the declination of the star.
www.tecepe.com.br /nav/inav_c11.htm   (0 words)

 CELESTIAL NAVIGATION   (Site not responding. Last check: )
Celestial Navigation is the art of finding your way based on the angle between the stars and the sun.
In celestial navigation, the navigator observes celestial bodies (Sun, Moon and stars) to measure his latitude.
The navigator aligns the sights with a heavenly body (such as the sun, moon, or stars), while an assistant reads its altitude from the position of the weighted line against a scale of degrees marked on the face of the quadrant.
www.millennium.scps.k12.fl.us /mknavigate.html   (534 words)

 Navis.gr - Marine Navigation   (Site not responding. Last check: )
In piloting, the navigator directs a vessel from one place to another by observing such landmarks on the Earth's surface as lighthouses, beacons, buoys, and prominent rocks and cliffs, and by measurements, called soundings, of water depths.
Since the apparent positions of celestial bodies thus change with time and with changes in an observer's position on the nearly spherical Earth, the location of a ship or other craft may be determined by careful observations of celestial bodies.
The altitude of a celestial body is the angle, measured by an observer on Earth, between the body and the horizon.
www.navis.gr /marinav/navig.htm   (2480 words)

 Navigation - Wikipedia, the free encyclopedia
Celestial Navigation is most often used out of sight of land using the stars as landmarks.
While celestial bodies were used to steer by, celestial navigation, as known today, was not used until the motion of the sun and stars was understood.
Early navigators could determine their latitude by measuring the angular altitude of Polaris any time that it was visible (excepting, of course, in those southern latitudes from where it cannot be observed).
en.wikipedia.org /wiki/Navigation   (2872 words)

 Columbus and Celestial Navigation
Although Columbus was primarily a dead reckoning navigator, he did experiment with celestial navigation techniques from time to time.
So it is not surprising that on his second voyage, there is no record that Columbus attempted to use celestial navigation (except for the fraudulent eclipse longitudes).
Errors of two or three degrees are rather large for a quadrant; a skilled navigator, at anchor, should be able to manage a degree or less of error.
www.columbusnavigation.com /cn.shtml   (2043 words)

 Discovernet: Australian Tales - Celestial navigation
One of the earliest known instruments used in celestial navigation was the kamal, used by Arabic sailors to determine their position in relation to the the North Star and their distance north or south of the equator, called latitude.
The navigator used the quadrant to measure the altitude of the North Star or the sun, and from this could estimate how far north or south they were from the equator.
The navigator pointed the staff at a spot about halfway between the horizon and the sun or a star, and then moved the crosspiece until the end of the short stick was in line with both the sun or star and the horizon.
amol.org.au /discovernet/tales/navigation.asp   (842 words)

 Sailing Safety
Celestial Navigation graduates will have mastered the techniques of open ocean position fixing using sextant and timepiece.
Plot a running fix from two celestial sightings separated by at least one hour, which is accurate within five miles.
Be familiar with Celestial Navigation terminology and theory.
www.sailingusa.info /celestial_navigation.htm   (405 words)

 Celestial Navigation - Reed's Nautical Ephemeris
Celestial navigation is the practice of navigating by means of the sun, stars, moon and planets.
Celestial navigation is based on spherical trigonometry and solving the “navigational triangle”—a theoretical triangle with the North or South Pole as one corner, the geographical position of the celestial body at another, and your assumed position as the third corner.
Reed's celestial navigation monthly data is presented in tables organized by month and is organized into six sections.
www.reedsalmanac.com /celestial_navigation_d.html   (505 words)

 Navigation - Celestial
For the navigator aspiring to a deeper level of understanding of celestial navigation theory and practice.
Not a celestial navigation textbook, but rather an essential guide to the mechanics of sextant use, adjustment, repair, history as well as buying guide to both new and used instruments.
The Nautical Almanac is the cornerstone for all celestial navigation.
www.paracay.com /nauticalbooks/CEL.html   (1785 words)

 Celestial Navigation Data   (Site not responding. Last check: )
This page allows you to obtain all the astronomical information necessary to plot navigational lines of position from observations of the altitudes of celestial bodies.
Data are shown for the navigational stars and planets only if their computed geocentric altitude, Hc, is equal to or greater than +1 degree at the place and time specified.
Almanac data for the Sun is shown if its Hc is greater than -12 degrees, the limit for nautical twilight (this is intended as an aid in judging the brightness of the sky).
aa.usno.navy.mil /data/docs/celnavtable.html   (794 words)

 Introduction to Celestial Navigation
For example, it is even possible to do some sort of celestial navigation with sticks and bits of paper, but that's not what we're talking about here.
The time honored "noon shot," where the navigator observes the sun while it is passing through its highest point for the day is a good place for us to start.
These three points form the "navigational triangle" and "sight reduction" or "solving the navigational triangle" is the process used to determine the altitude and azimuth the celestial object would have had if you had really been at your assumed position.
www.nav.org /cel/introduction.html   (0 words)

 JINX | CELESTIAL NAVIGATION   (Site not responding. Last check: )
With the modern seafarer¹s reliance on the state-of-the-art electronic navigation suites–GPS, radars, and electronic chart displays-navigation has perhaps been reduced to a pure science whose precision is measured in decimals.
Lacking modern navigation tools the navigator primarily relied on a few basic tools–the sextant, compass, and chronometer–and observations of the heavens to deduce his position at sea.
Successful navigation was a skill developed over time and through trial-and-error (provided the errors were not catastrophic).
www.jinxmagazine.com /celestial_navigation.html   (406 words)

 Celestial Navigation Course   (Site not responding. Last check: )
Celestial Navigation Course presented by Starpath Navigation and sponsored by the Bellingham Yacht Club byc.org and San Juan Sailing yachtworld.com/sanjuansailing
Only some 20% of the talk deals with special terms or topics of celestial navigation, so you are welcome to sign up a guest (as space permits) who might be interested in the night sky.
While at the university, he studied celestial navigation, raced on the varsity sailing team and was the commodore of the university yacht club.
www.modelsailboat.com /cnav.html   (714 words)

 Celestial Navigation
In order to do celestial navigation, you will need a chronometer, a sextant, an almanac, a sight-reduction method, plotting sheets and tools, and of course, the skills.
The lack of accurate timepieces held back navigation for many centuries, until John Harrison invented the marine chronometer in the mid-18th century.
If you've gotten a little rusty on the navigational fundamentals such as the geographical coordinate system, plotting techniques, and manipulating lines of position, here's a good way to brush up.
www.pilothousecharts.com /celestia.htm   (676 words)

 Space Adventures — Celestial Navigation Trainer < Equipment < Background Information   (Site not responding. Last check: )
The planetarium forms an illusion of observing a celestial sphere outside of the Earth's atmosphere, thus corresponding to the perception of an exterior visual situation and to observation of a starry sky in the actual spaceflight.
It is very effective means in training crews on attitude control and navigating with the help of stars position and by means of optical-and-visual instruments under conditions, which are close to the actual spaceflight.
It also provides variation of angular velocities of the celestial sphere rotation around each of the gimbaled axes in the range from 0.002 to 5 deg/s with an error of simulation of angular distances between stars of 12' and of star brilliance of 20%.
www.spaceadventures.com /media/info/equipment/navigation   (404 words)

 Where am I?   (Site not responding. Last check: )
With the advent of Satnav and GPS and the ever increasing affordability of the devices needed, the art of astronavigation is slowly dying.
Strictly speaking a "fix" is defined as a position obtained from fixed terrestrial objects while a "position" is that obtained from the moving celestial objects.
The sextant allows determination of zenithal distance to the sub-stellar point of a celestial body, the chronometer allows determination of the exact time of the above and the almanac allows determination of where that sub-stellar point was at the observed time.
www.dynagen.co.za /eugene/where/index.html   (1246 words)

 Celestaire - Navigation Instruments: Why Celestial Navigation?
Celestial / electronic is the only navigation combination that meets these requirements.
This hones navigational skills, yields the desired DR track, verifies correct GPS operation, and keeps your back-up system tuned, verified, and ready to rely on if needed.
More experienced celestial navigators can use an unknown star shot through a hole in the overcast, shoot planets in broad daylight, predict sunrise underway, and calculate great circle distances.
www.celestaire.com /page4.html   (565 words)

 Celestial Navigation   (Site not responding. Last check: )
Required Equipment: It is required that Celestial Navigation courses be conducted with an equipment inventory and publications adequate to enable the graduate to successfully pass the written examination and complete all the certification’s requirements.
Prerequisite: The prerequisite for Celestial Navigation Certification is Coastal Navigation Certification.
Certification Requirements: Celestial Navigation Certification requires the successful completion of the following knowledge and skills as demonstrated by passing a written examination, without the use of a programmed calculator.
www.ussailing.org /commercial/navigationcelestial.htm   (405 words)

 Amazon.com: Celestial Navigation for the Complete Idiot (Safe Boating Series): Video: Joe Renzetti,Gene ...   (Site not responding. Last check: )
Several years ago when we made our first video on Celestial Navigation, many people on our dock held up their arms in horror, as if we were approaching vampires with a cross: they all cried out in self defense: "that's not for me...
Hundreds of years ago, Celestial Navigation was considered a national secret, because the country that could navigate could find the best and fastest trade routes and would also be able to have its naval fleet rendezvous for battle.
Nowadays, utilizing the developments made by Nathaniel Bowditch (tables to solve the celestial triangle) and John Harrison (inventor of the first accurate portable chronometer), plus newer sextants, computers and quartz time keeping devices, celestial navigation is available to every sailor...
amazon.com /Celestial-Navigation-Complete-Idiot-Boating/dp/1882629035   (690 words)

 Amazon.com: Celestial Navigation: Books: Captain Dorothy LaFond   (Site not responding. Last check: )
I have been teaching celestial navigation in the class room for 10 years and taught off -shore on the schooner for trips to Bermuda and St. Thomas.
While teaching celestial navigation for high school ASTA students on a topsail schooner sailing the St. Lawrence River in Canada the idea for this manual was developed.
Illustrated Navigation — Thoroughly illustrated manual on traditional navigation, electronic navigation (using GPS and radar) and celestial navigation (using sextant).
www.amazon.com /Celestial-Navigation-Captain-Dorothy-LaFond/dp/0615116728   (1047 words)

 Celestial Navigation Accessories - Buy at Wholesale Prices from Online Marine
Additional celestial bodies may be plotted on the star base.
The unit consists of a dual star base, nine altitude azimuth templates centered at 10' intervals of latitude, meridian angle diagram and instruction sheet all enclosed in a soft plastic sleeve.
The celestial slide rule will significantly reduce the effod and time for determining values used in celestia navigation.
www.onlinemarine.com /online_superstore/navigation/celestia.htm   (176 words)

 Celestial Navigation Tables, Almanacs, and Forms
Visit our Celestial Navigation book section for educational or training books and star finders as well as other related navigational topics.
Celestial Navigation Work Forms are designed to work with sight reduction tables and nautical almanacs.
American Practical Navigator (Bowditch) describes the modern principles of marine navigation and includes the tables, data, and formulas required for dead reckoning, piloting, and celestial navigation.
www.waypoints.com /celestialsupplies.html   (487 words)

 IAP Seminar: Celestial Navigation at Sea -- Notes & Outline
The general navigation triangle: In the general case, we can locate three points that form a sort of triangle (a spherical triangle) on the surface of the earth.
One of the most important jobs of a navigator is to evaluate the accuracy and usefulness of information presented to her, including GPS data, chart data, as well as celestial fixes etc.
The sextant is an optical instrument that lets you read off the angle between two objects; in celestial navigation we measure the angle between the horizon and a celestial body.
web.mit.edu /decouto/www/iap-nav/notes.html   (3350 words)

 Celestial Navigation Equipment
Celestial Navigation is regarded by some as fl magic and by others as one of the finer arts of sailing.
Yet, the prudent navigator knows that back-up navigation strategies are necessary.
There's also something magical about navigating in concert with the physical world around you--learning the heavens to steer by the stars.
www.waypoints.com /celestial.html   (162 words)

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