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• The Celestial Sphere :.
• The celestial sphere is an imaginary sphere of gigantic radius with the earth located at its center. The poles of the celestial sphere are aligned with the poles of the Earth. The celestial equator lies along the celestial sphere in the same plane that includes the Earth's equator.
• The celestial sphere is a large sphere surrounding the earth and with it we can keep references to where celestial bodies lie in the sky. ...
• North Celestial Pole (NCP) and the South Celestial Pole (SCP) - these are just the north and south poles extended into space. ...
• Celestial Equator - The earth's equator, but at a much greater radius. If the earth's equator was a rubber band, then the celestial equator is the same rubber band just stretched away from the earth. ...
• Zenith- The point on the celestial sphere directly overhead. ...
• We can locate any object on the celestial sphere by giving it two coordinates, called the Right Ascension and the Declination. These are called celestial coordinates.
• Analogous to the longitude on Earth, the Right Ascension of an object on the celestial sphere is measured along the celestial equator, as the angular distance to some fiducial direction for with R. ... By convention, this fiducial direction is the point on the celestial where the Sun is found on the first day of spring (the vernal equinox).
• Analogous to the latitude on Earth, the Declination of an object on the celestial sphere is measured northward or southward from the plane containing the equator. The declination of the equator is 0 degrees, the North Celestial Pole, +90 degrees, the South Celestial Pole, -90 degrees.

• CELESTIAL SPHERE .
• If you go out at night (where the sky is dark) and look up at the sky, it will appear as if you are standing at the center (the stationary Earth) of a large hemispherical dome onto which the Celestial bodies are affixed. ...
• the Celestial Sphere .
• The Celestial Sphere was (and remains) an useful way in which to represent the Universe and, in fact, it is still the way astronomers choose to model the observable sky. The Celestial Sphere also gives us a natural way in which to picture the daily motions (diurnal motions) of the objects that we observe in the heavens. ...
• Physically the model does not make sense as we know that the Earth is not stationary, it is not in the center of the Universe, and the stars (and other celestial objects) are not attached to the surface of a large sphere (i. ...
• How is the Celestial Sphere model able to provide such an accurate representation of the Universe (and sky)? .
• Consequences of the Motions of Celestial Bodies .
• Since: (1) it is hard to tell that the Earth is moving and effects of the relative motion can be seen from either viewpoint; and (2) that over the course of a night (and over the short term) it is difficult to measure the predicted effects of the motions of the Celestial bodies and the Earth it is irrelevant whether the Earth is moving or the Celestial bodies move (at this levele). Because of this, the Celestial Sphere turns out to be an useful representation of the sky. ...

• Celestial Bodies Poster (high-quality art print) Celestial Bodies .
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• If you have any questions or comments about this Celestial Bodies Poster (high-quality art print) or any of my other posters, please contact me. ...
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• Celestial Navigation Theory Introduces Formulae for calculating distances between points on earth or on celestial sphere.
• Sextant Errors and Corrections Describes the errors arising from the sextant, atmosphere, and celestial objects themselves. ...

• 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. ...
• A sextant (for measuring the angle of celestial objects above the horizon,) an accurate clock that can be read to hours, minutes and seconds (four seconds error can put you off a mile) and , finally, a copy of the "Nautical Almanac" for the current year. ...
• For many of you "celestial navigation" means stars, so let's forge on.
• Assume you have measured the altitude (and time) for a number of celestial objects. ...
• This is the process most people think of when they think of "celestial navigation". ...
• ) The third point is the geographical position (GP) of the celestial object that you observed. ...
• 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. ...
• These people feel that "real" or "pure" celestial navigation requires that you use HO-229 for your sight reduction. ... For example, my favorite, the well recommended, "Practical Celestial Navigation" by Susan P. Howell uses HO-229 as does "Celestial Navigation for Yachtsmen" by Mary Blewitt and "A Star to Steer Her By" by Edward J. ... Just add HO-229 to the three items mentioned earlier (sextant, clock and Nautical Almanac) and you have everything you need for traditional celestial navigation.
• Volumes II & III are just like HO-229 but they are limited to celestial objects whose declination (angle above or below the celestial equator) is less than 29 degrees. ...
• Most modern books on celestial navigation are based on the use of HO-249. Some good examples are "Celestial Navigation by HO-249" by John E. Milligan, "One-day Celestial Navigation" by Otis S. ...

• CELESTIAL NAVIGATION .
• Celestial Navigation graduates will have mastered the techniques of open ocean position fixing using sextant and timepiece. They will be able to apply their knowledge of sight reduction methodology to enable them to reduce a sextant sight to a plotted line of position using any celestial body found in the Nautical Almanac.
• 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. ...
• Plot a running fix from two celestial sightings separated by at least one hour, which is accurate within five miles.
• Demonstrate sufficient proficiency with the sextant to obtain accurate celestial body altitudes.
• Be familiar with Celestial Navigation terminology and theory.
• Be familiar with techniques for computing sight reductions on celestial bodies.
• Understand how to determine latitude and longitude by sightings and sight reductions of celestial bodies.
• Understand the method of determining the deviation of the ship’s compass by use of a celestial body.

• Celestial Perspectives is a cyber environment dedicated to the concept of living consciously, by approaching all human endeavors with a spirit of open inquiry and creativity. ... Welcome to Celestial Perspectives, an interactive celebration of the multi-dimensional nature of all living things.
• Celestial Perspectives is proud to host the following sponsors: .

• Celestial Bodies Print.
• 30-day Return Policy and 100% Satisfaction Guarantee on Celestial Bodies Poster (high-quality Art Print)! .
• Note: my database indicates Celestial Bodies may be out of stock, or discontinued. ...

• Celestial Navigation in the Classroom.
• I have found that students of all ages quickly become interested in celestial navigation, as it provides a concrete link between the heavens and themselves, one that fills some of them with awe and amazement. ...
• I think the all-time best book for explaining the astronomy you need for understanding celestial navigation is H. ... Not only does the book redraw the constellations so that they look like what they are called, and so are very easy to find, but it has crystal-clear illustrations that explain why sidereal time is off solar time by four minutes; just what declinations and hour angles are; the ecliptic; the precession of the equinoxes and why Polaris hasn't always been the North Star; the celestial coordinate system, and more. ...
• Chapter 4 has Coordinate System and Celestial Mapping activities for children  include an astrolabe and star plotter, finding your latitude, etc. ...
• ASTRONOMY WITHOUT A TELESCOPE by Nick Strobel - terrific notes and diagrams - evrything you need for "naked eye" astronomy, and hence celestial navigation! Don't miss this site!.
• Math: Celestial navigation in its modern form is based on solving spherical triangle problems (the "navigational triangle") and there is a good site for Navigational Trigonometry, but your students don't have to be taking trigonometry to use celestial navigation. ... Umland has online: Umland's Short Guide to Celestial Navigation). ...
• The Celestaire company has a booklet called Celestial Positioning: A Teacher's Guide to and Earth Science Project with History, Mathematics and Astronomy Integration which is available free to teachers. ...
• Christopher Columbus Navigation Page, with a Celestial Navigation page. ...
• Why isn't there more online about Nathaniel Bowditch? This Salem resident was entirely self-taught in mathematics and astronomy (and taught himself Latin so he could read Newton's Principia), and had such a great effect on celestial navigation that his book, The American Practical Navigator  (originally published in 1802), is still called "Bowditch" after many revisions. ...
• Did you know that slaves in the Underground Railroad used celestial navigation? The following is from the description of a video I have not seen from NASA and the National Park Service called The Underground Railroad: Connections to Freedom and Science:.
• "Slaves traveling the Underground Railroad, usually on foot, depended on celestial navigation to find their way northward. ... The purpose of this video is to increase student awareness of the Underground Railroad and the role celestial navigation played in the Railroad's success. ...
• American explorers Lewis and Clark used celestial navigation. ...
• Knowledge of celestial navigation and of the stars and constellations will enhance your students' understanding of Melville, (and don't forget the wonderful new novel, Ahab's Wife, or the Stargazer) Conrad, Spencer, Ovid, Shakespeare, Pope, Milton, Longfellow, the entire Western canon, Arabic and other eastern literature. ...

• CELESTIAL NAVIGATION .
• If you would like a refresher course on Sextant Use, see our video #303 "Celestial Navigation, the Sun NoonShot". ...
• History of Celestial Navigation theory .
• The Celestial Sphere .
• Celestial North and South Pole .
• the Prime Celestial Meridians .
• the Celestial Horizon .
• Celestial Line of Position .
• Solving the Celestial Triangle .
• Local Hour Angle (LHA) of the celestial body .

• end of topnav replacement --> Planetarium Courses The planetarium conducts courses throughout the year on topics ranging from celestial navigation to astronomy to family skywatching. ...
• Basic Celestial Navigation Basic Celestial Navigation is a ten week course meeting at the Planetarium's Susan Peterson Howell Room on Tuesdays, 7:30- 9:30 PM, from 14 September - 16 November 2004. ...

• Now for some reference makers: The stars rotate around the North and South Celestial Poles. ... The Earth's axis of rotation intersects the celestial sphere at the celestial poles. The number of degrees the celestial pole is above the horizon is equal to the latitude of the observer. Fortunately, for those in the northern hemisphere, there is a fairly bright star real close to the North Celestial Pole (Polaris or the North star). Another important reference marker is the celestial equator: an imaginary circle around the sky directly above the Earth's equator. ... All the stars rotate in a path that is parallel to the celestial equator. The celestial equator intercepts the horizon at the points directly east and west anywhere on the Earth. ...
• If you joined Santa last Christmas at the north pole (90 degrees latitude), you would have seen Polaris straight overhead and the celestial equator on your horizon. The point straight overhead on the celestial sphere for any observer is called the zenith and is always 90 degrees from the horizon. ... The positions of the zenith and meridian with respect to the stars will change as the celestial sphere rotates and if the observer changes locations on the Earth, but those reference marks do not change with respect to the observer's horizon. Any celestial object crossing the meridian is at its highest altitude (distance from the horizon) during that night (or day). ...
• For each degree you move south with Santa in his sleigh, the North Celestial Pole (NCP from here on) moves 1 degree away from the zenith toward the north and the highest point of the celestial equator's curved path in the sky moves up one degree from the southern horizon. This effect has nothing to do with the distance between a celestial object or marker and you at different points on the Earth (remember that the celestial sphere has a practically infinite radius). In fact, observers on a spherical world only ten miles across would see the same effect! The picture above shows the celestial sphere for the far northern city of Fairbanks in Alaska. ...
• The celestial sphere for observers in Seattle and any other observer at the same latitude (47° N) on the Earth is shown above. ...
• Because the Earth's equator is 90° away from the north pole, the celestial equator as seen in Los Angeles will arc up to 90 - 34 = 56 degrees above the southern horizon at the point it crosses the meridian. ... The stars rise in the east part of the sky, move in arcs parallel to the celestial equator reaching maximum altitude when they cross your meridian, and set in the west part of the sky. ...

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