celestial navigation, the hour angle is the dihedral angle between the meridian plane (containing Earth's axis and the zenith) and the hour circle (containing...

\tan \delta } where: ω ∘ {\displaystyle \omega _{\circ }} is the solar hour angle at either sunrise (when negative value is taken) or sunset (when positive...

to the hour circle passing through the object. Unlike right ascension, hour angle is always increasing with the rotation of Earth. Hour angle may be considered...

and 180 degrees when the hour angle, h, is negative (morning) and the angle between 180 and 360 degrees when the hour angle, h, is positive (afternoon)...

{\displaystyle \alpha _{s}=90^{\circ }-\theta _{s}} h {\displaystyle h} is the hour angle, in the local solar time. δ {\displaystyle \delta } is the current declination...

and hour angle at a specific location, modify the formula for a spherical Earth. Replace φ2 with declination and longitude difference with hour angle, and...

thousands of years. Mean solar time is the hour angle of the mean position of the Sun, plus 12 hours. This 12 hour offset comes from the decision to make...

geometry, an angle can refer to a number of concepts relating to the intersection of two straight lines at a point. Formally, an angle is a figure lying...

average of Q over a day is the average of Q over one rotation, or the hour angle progressing from h = π to h = −π: Q ¯ day = − 1 2 π ∫ π − π Q d h {\displaystyle...

official noon. This correction can easily be made by rotating the hour-lines by a constant angle equal to the difference in longitudes, which makes this a commonly...

By measuring the angle of the celestial body in the sky, the observer can get the local hour angle (LHA) of X, which is the angle subtended at P between...

the sunrise hour angle using the sunrise equation; Calculate the sunrise time, which is the solar noon time minus the sunrise hour angle in degree divided...

an hour circle at any time. The hour circle is a subtype whereby it is expressed in hours as opposed to degrees, radians, or other units of angle. The...

Calculate the sunset hour angle using the sunset equation; Calculate the sunset time, which is the solar noon time plus the sunset hour angle in degree divided...

astronomy, the parallactic angle is the angle between the great circle through a celestial object and the zenith, and the hour circle of the object. It...

altitude Equatorial coordinates α, right ascension δ, declination h, hour angle Ecliptic coordinates λ, ecliptic longitude β, ecliptic latitude Galactic...

positions of navigational stars — expressed as declination and sidereal hour angle — are often rounded to the nearest degree. In addition to tables, star...

presented in the 2007 book What Is Intelligence? by James R. Flynn Sidereal hour angle, in astronomy Intel SHA extensions Measure of material hardness using...

sight must be known so that the celestial position i.e. the Greenwich Hour Angle (Celestial Longitude - measured in a westerly direction from Greenwich)...

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...

sidereal time can be used to determine the time of its culmination (see hour angle). The term meridian comes from the Latin meridies, which means both "midday"...

Kurt Steven Angle (born December 9, 1968) is an American retired professional wrestler and amateur wrestler. He first earned recognition for winning a...

to 24h. It is important not to confuse sidereal hour angle with the astronomical concept of hour angle, which measures the angular distance of an object...

Apparent solar time can be obtained by measurement of the current position (hour angle) of the Sun, as indicated (with limited accuracy) by a sundial. Mean solar...

Look up hour in Wiktionary, the free dictionary. An hour is a unit of measurement of time. (The) Hour(s) may also refer to: Hour angle, the measurement...

horsepower-hour (hph), a measure of energy used in the railroad industry hour angle, a measure of the angle between the meridian plane and the hour circle...

azimuth Zn must be computed. The local hour angle, LHA, is the difference between the AP longitude and the hour angle of the observed object. It is always measured...

In 1931, Longines collaborated with Charles Lindbergh to introduce the Hour Angle aviation watch. In 1937, P.V.H. Weems again collaborated with Longines...

systems design and implementation with a view to maximising service Hour angle, in astronomy, one of the coordinates of the equatorial coordinate system...

Retrieved 30 April 2025. Urban & Seidelmann 2013, "Glossary" s.v. hour angle, hour circle, sidereal time. Urban & Seidelmann 2013, p. 78. IERS 2013. Bartlett...