hour angle

"Figure your hour angle," Hans said and looked at his watch.

Let h be the hour angle when Q becomes positive.

Mean solar time is the hour angle of the mean Sun plus 12 hours.

Unlike right ascension, hour angle is always increasing with the rotation of the Earth.

Hour angle may be considered a means of measuring the time since an object crossed the meridian.

The sights are then set using the local hour angle and the declination of whatever astronomical body is being used.

A star on the observer's celestial meridian is said to have a zero hour angle.

This will introduce error in sundials that do not have equal hour angles.

The hour angle of the vernal point is, by definition, the observer's sidereal time.

Of course, an hour angle of zero means the object is currently on the local meridian.

J is the hour angle for solar transit (or solar noon).

It is common for inexpensive decorative sundials to have incorrect hour angles, and these cannot be adjusted to tell correct time.

When calculating topocentric phenomena, right ascension may be converted into hour angle as an intermediate step.

More generally, in the particular case of two planets, it means that they merely have the same right ascension (and hence the same hour angle).

Using an object's right ascension and the local sidereal time it is possible to determine the time of its culmination (see hour angle).

It has the capability of reading off the latitude, hour angle, and azimuth without computation thereby eliminating mathematical errors.

It is designed to give immediately the azimuth and hour angle by observation of the altitudes of the heavenly bodies.

Sidereal hour angle, used in celestial navigation, is similar to right ascension, but increases westward rather than eastward.

Hour Angle - music generated live from the declination and hour angle of the sun.

The hour angle is paired with the declination to fully specify the direction of a point on the celestial sphere in the equatorial coordinate system.

The latitude of the geographic position is called declination, and the longitude is usually called the Hour angle.

This angle, known as the Greenwich Hour Angle', gives its Longitude.

Confusion between Northern and Southern hour angles (Right Ascension)

Observing the sun from earth, the solar hour angle is an expression of time, expressed in angular measurement, usually degrees, from solar noon.

The cosine of the hour angle (cos(h)) is used to calculate the solar zenith angle.