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With a local declination of 14°E, a true bearing (i.e. obtained from a map) of 54° is converted to a magnetic bearing (for use in the field) by subtracting declination: 54° – 14° = 40°. If the local declination was 14°W (−14°), it is again subtracted from the true bearing to obtain a magnetic bearing: 54°- (−14°) = 68°.
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle. The declination angle is measured north (positive) or south (negative) of the celestial equator , along the hour circle passing through the point in question.
Declination (vertical arcs, degrees) and hour angle (horizontal arcs, hours) is shown. For hour angle, right ascension (horizontal arcs, degrees) can be used as an alternative. The equatorial coordinate system is a celestial coordinate system widely used to specify the positions of celestial objects .
A second triangle is drawn to the right, with a top angle of D, the declination of the wall. Finding SD- the substyle length. The bottom bar of the left triangle represents cot Φ. The length is noted and using dividers copied over to the hypotenuse of the right triangle, and a further horizontal bar drawn; that will have the length of sin D.
The components for proper motion in the equatorial coordinate system (of a given epoch, often J2000.0) are given in the direction of right ascension (μ α) and of declination (μ δ). Their combined value is computed as the total proper motion (μ). [2] [3] It has dimensions of angle per time, typically arcseconds per year or milliarcseconds ...
Right ascension and declination as seen on the inside of the celestial sphere. The primary direction of the system is the March equinox, the ascending node of the ecliptic (red) on the celestial equator (blue). Right ascension is measured eastward up to 24 h along the celestial equator from the primary direction.
Declination: Constellation: North Pole +90° latitude 12 h 51.4 m +27.13° Coma Berenices (near 31 Com) South Pole −90° latitude 0 h 51.4 m: −27.13° Sculptor (near NGC 288) Center 0° longitude 17 h 45.6 m: −28.94° Sagittarius (in Sagittarius A) Anticenter 180° longitude 5 h 45.6 m +28.94° Auriga (near HIP 27180)
Also, even the finest graduations on setting circles are usually more than a degree apart, which makes them difficult to read accurately, especially in the dark. Nothing can be done if the optical tube is not perpendicular to the declination axis or if the R.A. and Dec axes are not perpendicular, because these problems are next to impossible to ...