French Perpetual Calendar Clock - Barometer - Thermometer - The Equation of Time

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Seller: maryrose7915 (377) 100%, Location: Northamptonshire, Ships to: Free Local Pickup, Item: 253864914008 Superb French Perpetual Calendar Mantle Clock Dual markings to backplate: Samuel Marti et Cie, Paris, Medaille De Bronze. Gay & Vicarino & Co, Paris. (See 2nd Image) Samuel Marti et Cie, Paris, Clockmaker. Gay & Vicarino & Co, Paris are listed in Britten's 'Old Clocks, Watches and their Makers' as having retail premises in London in 1864-75 so it is possible that G.V & Co. were merely the retailers as the clock was produced with a calendar dial for the English market. Emile Gay moved to London in 1861. He initially partnered with Adolphe Vicarino before Lamaille bought Vicarino out when the company became ‘EGL’ (Emile,Gay & Lamaille (George) Two piece enamel dial with blued steel hands, Lower Left there is the Moon Phase indicator which shows the current Moon phase applicable to the Day, Date and Month that is showing on the three subsidiary dials. The Equation of Time (difference between mean and solar time) is shown by the position of a extra hand that moves left or right (+/-) along the equation marker. (The difference between Mean time and Solar Time can be as much as 16 min 33 s ahead or as much as 14 min 6 s behind. I will explain this in full below... The case is in good order and running as you would expect, changing through the days and months correctly whilst the moon passes through it’s phases. The clock is very advanced as it also automatically moves from February 28th through to March 1st without the need to manually pass the 29th,30th & 31st. Mercury pendulum and original key, Rise and Fall suspension. To the Lower Right is a Thermometer set below the Aneroid Barometer dial. THE EQUATION OF TIME (E.O.T) EXPLAINED: The equation of time describes the discrepancy between two kinds of solar time. The word equation is used in the medieval sense of "reconcile a difference". The two times that differ are the apparent solar time, which directly tracks the diurnal motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with noons 24 hours apart. 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 time, for the same place, would be the time indicated by a steady clock set so that over the year its differences from apparent solar time would resolve to zero. The equation of time is the east or west component of the analemma, a curve representing the angular offset of the Sun from its mean position on the celestial sphere as viewed from Earth. The equation of time values for each day of the year, compiled by astronomical observatories, were widely listed in almanacs and ephemerides. The concept During a year the equation of time varies, its change from one year to the next is slight. Apparent time, and the sundial, can be ahead (fast) by as much as 16 min 33 s (around 3 November), or behind (slow) by as much as 14 min 6 s (around 12 February). The equation of time has zeros near 15 April, 13 June, 1 September and 25 December. Ignoring very slow changes in the Earth's orbit and rotation, these events are repeated at the same times every tropical year. However, due to the non-integer number of days in a year, these dates can vary by a day or so from year to year. the obliquity of the ecliptic (the plane of the Earth's annual orbital motion around the Sun), which is inclined by about 23.44 degrees relative to the plane of the Earth's equator; and the eccentricity of the Earth's orbit around the Sun, which is about 0.0167. The equation of time is constant only for a planet with zero axial tilt and zero orbital eccentricity. On Mars the difference between sundial time and clock time can be as much as 50 minutes, due to the considerably greater eccentricity of its orbit. The planet Uranus, which has an extremely large axial tilt, has an equation of time that makes its days start and finish several hours earlier or later depending on where it is in its orbit. As I’m sure you’d agree with the E.O.T this is a very very advanced clock for its time. COLLECTION ONLY HOWEVER DELIVERY CAN BE ARRANGED.. please enquire prior to purchasing. Age: Antique, Pre-1900, Sub-Type: Mantel Clock, Type: Mantel/ Carriage Clock, Material: Marble/ Stone, Style/ Origin/ Theme: French, Clock Type: Calendar Clock, Features: Thermometer

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