The " equation of time ", for example, is a correction that must be applied to the reading of a sundial in order to obtain mean time, as would be shown by a clock.

Hyperbolas arise in practice in many ways: as the curve representing the function in the Cartesian plane, as the appearance of a circle viewed from within it, as the path followed by the shadow of the tip of a sundial, as the shape of an open orbit ( as distinct from a closed and hence elliptical orbit ), such as the orbit of a spacecraft during a gravity assisted swing-by of a planet or more generally any spacecraft exceeding the escape velocity of the nearest planet, as the path of a single-apparition comet ( one travelling too fast to ever return to the solar system ), as the scattering trajectory of a subatomic particle ( acted on by repulsive instead of attractive forces but the principle is the same ), and so on.

The house is named after Sir Arthur Luxmoore, Lord Justice of Appeal, ( King's Scholar, 1889 ), and his own sundial stands in the back garden.

This is similar to how the time kept by a sundial can be used to find the location of the Sun.

* The Obelisk of Montecitorio is brought from Egypt to Rome by emperor Augustus to be erected as a sundial gnomon of the Solarium Augusti, now in the Piazza Montecitorio.

One of the town ’ s hallmark features is the giant sundial, located in the rose gardens in front of the planetarium on Franklin Street.

A noon cannon, sometimes called a ' meridian cannon ', is a specialized sundial that is designed to create an ' audible noonmark ', by automatically igniting a quantity of gunpowder at noon.

" Other mottoes are more whimsical: " I count only the sunny hours ," and " I am a sundial and I make a botch / of what is done far better by a watch.

If a horizontal-plate sundial is portable and is made for the latitude in which it is being used, and if the user has a watch and the necessary information to calculate the local sundial time from its reading, the sundial can be used to find the directions of True North, South, etc.

Such a sundial can be adjusted to any latitude by tilting it so its gnomon is parallel to the Earth's axis of rotation.

This property of self alignment is only true for diptychs historically in the case for a combination of an analemmatic and a vertical sundial.

There is a commemorative sundial at Leeds Castle telling the time in Belvoir, Virginia and a corresponding sundial in America.

In astronomy, an analemma (; from Greek ἀνάλημμα " pedestal of a sundial ") is a curve representing the changing angular offset of a celestial body ( usually the Sun ) from its mean position on the celestial sphere as viewed from another celestial body ( usually the Earth ).

This can be interpreted as how " fast " or " slow " the Sun ( or a sundial ) is compared to clock time.

The further west the Sun is, compared with its mean position, the more " fast " a sundial is, compared with a clock.

The sundial should be placed on a horizontal surface, and rotated about a vertical axis until it shows the correct time.

One leaf formed a vertical sundial, the other a horizontal sundial.

A Diptych made as stated as a combined vertical and horizontal sundial with a string gnomon will show the same time on both dials regardless of orientation.

Barnwell is home to what is thought to be the only vertical freestanding sundial in the USA, though counter-examples exist.

It is thought to be the only free-standing, vertical sundial in the country.

They also built a sundial together, which they placed above the front door of their cottage.

In 1915, Bostonians placed a memorial seat and sundial behind Holmes's final home at 296 Beacon Street in a spot where he would have seen it from his library.

In 1930 a sundial was placed to further memorialize Zachary Taylor.

An ironwork sundial, originally placed in the park in 1990 after a Festival of Iron event, was removed in 2006 and replaced by a small round formal garden to honour Stuttgart ( Cardiff's German twin-town.

A sundial in the front garden records the visit in fine Latin verse.

The sundial in front of Morehead Planetarium.

The Barnwell sundial was surrounded by a parking lot in the 1960s but in the 1990s the city removed the parking lot, built a park, and made the sundial a focal point.

The sundial, which measures the time of day by using the sun casting a shadow onto a cylindrical stone, was widely used in ancient times.

A well-constructed sundial can measure local solar time with reasonable accuracy, and sundials continued to be used to monitor the performance of clocks until the modern era.

These early water clocks were calibrated with a sundial.

In 1465, he built a portable sundial for Pope Paul II.

The watchmaker analogy, framing the argument with reference to a timepiece, dates back to Cicero, who used the example of a sundial or water-clock in his reasoning that the presence of order and purpose signify the existence of a designer.

Before the invention of clocks, people marked the time of day with apparent solar time ( also called " true " solar time ) – for example, the time on a sundial – which was typically different for every settlement.

In 1673 an astronomical and astrological sundial was created in the main building of the college, called " horologe solaire ", which still can be visited today.

Shakespeare's audience similarly did not ask whether the University of Wittenberg had existed in Hamlet's day, or whether clocks that struck time were available in Julius Caesar's ancient Rome: Shakespeare portrayed Brutus, plotting to assassinate Caesar in 44 BC, being interrupted by the striking of the clock, although ancient Rome was the era of the sundial, with invention of the mechanical clock dating from the 11th-13th centuries AD.

The typical noon-mark sundial was a lens set above an analemmatic plate.

" Collections of sundial mottoes have often been published through the centuries.

* Scottish sundial — the ancient renaissance sundials of Scotland.

Diptych sundial in the form of a lute, circa 1612.

What makes the current phenomenon unique is that so many science-fiction writers have reversed a trend and turned to writing works critical of the impact of science and technology on human life.

One of the inescapable realities of the Cold War is that it has thrust upon the West a wholly new and historically unique set of moral dilemmas.

But Oakwood Heights is unique in one particular.

The structure appears to be unique among OOH compounds, but is the same as that assumed by Af.

A number of unique medical problems might be created when man is exposed to an infectious agent through the respiratory route rather than by natural portal of entry.

These operators D and N are unique and each is a polynomial in T.

It is interesting that a 1: 1 correspondence can be established between the lines of two such pencils, so that in a sense a unique image can actually be assigned to each tangent.

Hence, thought of as a line in a particular plane **yp, any tangent to Q has a unique image and moreover this image is the same for all planes through L.

Spontaneity training theory is unique and relatively new.

This weakness is not unique to labor surplus areas, for it is inherent in the system of local school districts in this country.

What with traders trading for so many different objectives, and what with there being so many unique and individualized market theories and trading techniques in use, and more coming into use all the time, it is hard to imagine how any particular theory or technique could acquire enough `` fans '' to invalidate itself.

Probably the primary reason for special treatment of a net operating loss carryover is the unique opportunity it presents for tax avoidance.

It is the classroom teacher, however, who has daily contacts with pupils, and who is in a unique position to put sound psychological principles into practice.

One reason for the unique vitality of the chorus is its great variety in expression.

The policy may not be unique but the maximum value of P certainly is, and once the policy is specified this maximum can be calculated by ( 2 ) and ( 3 ) as a function of the feed state Af.

Sir Julian Huxley in his book Uniqueness Of Man makes the novel point that just as man is unique in being the only animal which requires a long period of infancy and childhood under family protection, so is he the only animal who has a long period after the decline of his procreativity.

Most people do not realize that the congregation, as a gathered fellowship meeting regularly face to face, personally sharing in a common experience and expressing that experience in daily relationships with one another, is unique.

A sense of self-certainty and the freedom to experiment with different roles, or confidence in one's own unique behavior as an alternative to peer-group conformity, is more easily developed during adolescence if, during early childhood, the individual was permitted to exercise initiative and encouraged to develop some autonomy.

First, the State Department is unique among government agencies for its lack of public supporters.

The death of a man is unique, and yet it is universal.