Sundials in Europe – GAUDIUM SUB SOLE . SUNDIALS . MEDIEVAL TO MODERN

MUSÉE de CLUNY . PARIS – Cadran Solaire 1674: Nil Sine Nobis

Published on April 11, 2023April 13, 2023 by Rolling HarbourLeave a comment

The collection of the National Museum of the Middle Ages is housed in a wonderful building, at one time an abbatiale. There is some debate about the dates of the origins and the building of the Hôtel; and of later rebuilding / restoration. The large sundial on the south wall of the courtyard is dated 1674. This was the reign of the Sun King (1643 – 1715), and a sun with its rays was an obviously fitting theme for the times.

DIAL

The lines on the dial face are carefully graduated and the hours marked with Arabic numerals. Several lines terminate in arrows, suggesting a busy schedule of mainly forenoon masses.

MOTTO

NIL SINE NOBIS. A. B. F. 1674.

The inscription is usually translated as Nothing [Exists] Without Us. Margaret Gatty (1809-18730, in her comprehensive work The Book of Sun-Dials, gave the Cluny dial an unusually detailed entry:

802.

NIL SINE NOBIS. A. B. F. 1674. Nothing exists without us.

A dial on the wall of a courtyard on the south side of the Hôtel Cluny, Paris, had this inscription. The word nobis referred to the rays of the sun which were represented on its face. The Hôtel Cluny, a very beautiful specimen of rather elaborate fourteenth century Gothic architecture, was bought in 1625 for the abbess and nuns of Port Royal, and was known as Port Royal de Paris. It was re-established by Louis XIV. in 1665, on a fresh basis, and was looked upon as schismatic by the community of Port Royal des Champs. This dial must have been erected in the time of the first abbess of the new foundation, Sœur Dorothée Perdreau, who held office till 1684.

Cluny Museum and its sundial: detailed entry by Margaret Gatty

SCALLOP SHELLS and HERALDIC MOTTOS

The scallop shells are interwoven with two inscriptions (or possibly a single one in two parts) which deserve a mention as part of the overall design. The shells themselves evidence an ancient Pilgrimage route that passed close by – the long Rue St Jacques is a few meters to the North.

The heraldic mottos are said to read, firstly: Servire Deo Regnare Est – To Serve God Is To Reign; MG suggests, without much conviction, that the other (or part of it) may be as shown below.

With very rusty Latin and a bit of internet work, I can’t make either interpretation fit the scrolls we can see. Possibly they relate to a different part of the Musée, and the shell one(s) are different. I’ll have to leave the reader to try to puzzle this out (all suggestions welcome).

GSS Category: Early Sundial / Vertical Dial; French Sundial; Sundial Motto

Credits: all photos Keith Salvesen – please seek use permission for these detailed ones; Musée Cluny for the Unicorn

MUSEUM VAN LOON . KEIZERSGRACHT . AMSTERDAM – 3 Sundials

Published on February 1, 2023February 3, 2023 by Rolling HarbourLeave a comment

The attractive gardens of the Van Loon Museum contains 3 very different dials. In the centre is an armillary sphere (C19?). By the steps is a complicated early scaphe dial dated 1582. I have included B&W images, which can sometimes be useful for seeing details on multiple dials. The third dial with a weather vane is high up in the centre of the upper gallery overlooking the garden. I am trying to find out a date for it.

ARMILLARY SPHERE

SCAPHE DIAL 1578

VERTICAL DIAL AND WEATHER VANE

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GSS Categories: Armillary Sphere; Cube Dial; Multi Dial; Scaphe Dial; Modern Dial; Amsterdam Dial

All photos: Keith Salvesen

MONUMENTAL SUNDIAL . MUSEO GALILEO . FLORENCE

Published on October 18, 2022October 22, 2022 by Rolling HarbourLeave a comment

Lizard / Viper Gnomon of Monumental Dial . Museo Galileo . Florence

MONUMENTAL SUNDIAL . MUSEO GALILEO . FLORENCE

The Museo Galileo‘s Monumental Sundial was built as a mathematical ornament in 2007. The slender bronze column (stele) is in fact formed from two matching columns closely aligned, symbolising day and night. The (mid)day stele faces south, with a vertical meridian line on which the shadow is cast by a lizard’s tail (actually, an imaginary half-lizard, half-viper). The night stele faces north and signifies the constellations Ursa Major and Ursa Minor that enable the Pole Star to be identified.

Monumental Dial . Museo Galileo . Florence

The encircled quadrant design on the pavement at the base of the bronze columns indicates the geographic orientation. This glass base of the gnomon, and also the Zodiac signs in the meridian line (below), are up-lit after dark.

Orientation dial . Monumental Dial . Museo Galileo . Florence

The Museo explains the meridian line in helpfully simple terms: A travertine and brass meridian line is drawn on the pavement, flanked with glass and marble signs of the Zodiac. The meridian line extends for about 15 metres from the museum entrance, where the winter solstice is marked, to the base of the gnomon, where the summer solstice is marked. The travertine curves crossing the meridian line indicate the date. The brass radial lines forming a grid with the two solstitial curves indicate the hours.

The seasons and the four elements are symbolised by the choice of materials: travertine for the earth and autumn; glass for the water and winter; grey stone for the air and spring; bronze for the fire and summer.

LIZARD / VIPER GNOMON ON THE SOUTH FACE OF THE COLUMN

This extraordinary sundial stands by the Arno with the Ponte Vecchio (which itself has a wonderful dial LINK) close by to the west. For anyone with even a minuscule interest in or curiosity about the gradual development of scientific instruments and techniques from medieval times onwards, pay a visit to the excellent online gallery LINK. Look in particular for the two astronomical telescopes made by Galileo himself.

The North American Sundial Society has very good online information about this unique dial. You can watch a short animation of how this gnomonic sundial works here LINK

For those interested in finer details of the way the dial works, the museum’s detailed account is included at the end of this article.

Museo Galileo – Istituto e Museo di Storia della Scienza

Museo Galileo – Monumental Sundial

NASS (North American Sundial Society) Video: Filippo Camerota, Luise Schnabel, Giorgio Strano

How the Sundial works

The shadow cast by the glass polyhedron atop the large bronze gnomon indicates the date and time. The hours from 9:00 AM to 2:00 PM are marked out by radial brass lines. The date is indicated by the travertine traversal lines which mark the Sun’s diurnal course for various periods of the year – precisely when the Star enters the signs of the Zodiac. The shadow cast by the gnomon changes in length during the course of the days and seasons, and indicates true solar time for the place where it is located, which is a different time than that of our wristwatches, known as mean time. In respect to mean time, true solar time has a periodic variation that can exceed a quarter of an hour.

Moreover, during daylight saving time, the hands of a clock are moved forward one hour. For example, true midday in the month of February would be indicated by the sundial around 12:28 AM while in the month of July it would be indicated around 1:20 PM daylight saving time.

To read the hour and date, you have to identify the hour lines and the calendrical lines closest to the gnomon’s shadow. When the shadow does not fall exactly on a hour line, you can read the half-hours and quarters with close approximation by ideally subdividing the space between two hour lines in two or four parts. The date can also be read by referring to the Zodiac signs and the start of the months marked out along the meridian line.

© 2018 – 2022 Museo Galileo – Istituto e Museo di Storia della Scienza
Piazza dei Giudici 1 · 50122 Firenze · ITALIA
tel. +39 055 265 311 – P.I. 01346820481

LLUC MONASTERY . MALLORCA . COMPLEX MULTI-DIAL: from Canonical to 20th Century

Published on July 17, 2022July 18, 2022 by Rolling HarbourLeave a comment

Multiple Vertical Sundial, Lluc Monastery, Mallorca (Keith Salvesen) — Lluc Monastery . Mallorca – Sundial (Keith Salvesen)

The secluded Monastery of Lluc is situated near Escorca in the Tramuntana mountains of Mallorca. It dates from the c13, and is famous for its Black Madonna, the discovery of which is said to have led to the monastery’s foundation . It is a place of pilgrimage. The location is remote and peaceful, though inevitably the monastery has become an essential stop on the tourist and coach party trail. We returned there recently, not having visited Mallorca for more than 20 years. The buildings were much as we remembered, but the parking and visitor arrangements were more regimented and complex. Before, one just drove down the narrow road from the main mountain road and parked in the forecourt area close to the buildings. Now, everything is (unsurprisingly) geared to a daily mass influx of people and their needs for sustenance and souvenirs. We were pleased to see that it is still possible to stay at Lluc in one of small rooms under a long covered walk where the monks once slept. You can even book a room for the night.

A short walk from the monastery, there is a path that leads up to a calvary and some great views. Along the way is an amazing multiple vertical sundial. It was designed by Rafael Soler, and carved in 1991. It displays with some style the evolution of sundials from medieval to modern. There are two historical dials, one solar dial, and two seasonal dials.

CANONICAL HOURS – LATINATE

This dial simply records the 3-hourly canonical divisions of the liturgical day (as with the early medieval mass / scratch dials), starting with midnight (top) and working counterclockwise round a central gnomon.

Lluc Monastery . Mallorca – Sundial (Canonical)

CANONICAL HOURS – BABYLONIAN / MALLORQUIN

A more complex dial, starting at noon shown as XXIV (I’m not clear why not XII) through to 21.00. The dial includes months and the signs of the Zodiac.

Lluc Monastery . Mallorca – Sundial – Babylonian / Mallorquines

TEMPS VERTADER – TRUE SOLAR TIME

The centre dial shows true solar time. The polar gnomon (triangular) shows the hours, the pointer shows the date with the declination lines. The inscription MULIER AMICTER SOLE (Woman Clothed by the Sun) references an account in the Book of Revelations. You can find out more HERE

MEAN TIME DIAL (SUMMER /AUTUMN)

The two right-hand sundials are complementary and each covers two seasons. Presumably for a particular month, one dial will be reliable as to time and the ‘off-season’ one will not. The words are Catalan eg Hores Mitjanes = Mean Time; Estiu I Tardor = Summer and Autumn.

MEAN TIME DIAL (WINTER / SPRING)

The creation of these dials was obviously a labour of love and skill combined. There’s doubtless plenty more to be said about these sundials and the splendid ensemble but I decided not to get too technical – indeed, as an amateur I don’t understand enough to do so. The rather washed out appearance of the images was operator error – I had the camera on the wrong settings and didn’t realise until too late…

GSS Category: canonical to modern multi-dial; sundial Lluc Mallorca

All photos: Keith Salvesen; snippet from BSS record

Original Credits: ‘Props to arby101ca and lumbricus, members of a geocaching & waymarking website called Groundspeak. They hiked to Lluc (respect!) and wrote informatively about these dials. I found relatively little elsewhere.