SIHH 2018 | Panerai - L’Astronomo Luminor 1950 PAM00920

Innovation and high quality watchmaking are combined in the new L’Astronomo Luminor 1950 Tourbillon Moon Phases Equation of Time GMT, the latest exclusive creation from Officine Panerai dedicated to Galileo Galilei and the first reference to have moon phase indication.

For this model, the iconic Luminor 1950 case houses a concentration of technical solutions as a demonstration of the ability of the Florentine brand to interpret traditional haute horlogerie complications in ways which are distinctive yet in line with the sport heritage of the brand.

The first Panerai L’Astronomo, presented in 2010 on the occasion of the 400th anniversary of the celestial observations made by Galileo as a result of the invention of the telescope, was the first timepiece created by Panerai with a tourbillon regulator, calendar, equation of time indication and the display of the times of sunrise and sunset.

Like its predecessor, the new L’Astronomo is made to order, and the skeletonised movement, the P.2005/GLS (standing for Galileo Luna Scheletrato), is personalised to operate in accordance with the geographical coordinates of a place chosen by the client.

It provides the same range of functions as the first L’Astronomo, and in addition, GMT, indication of the phases of the moon and an original system for displaying the date using polarised crystals.

On the back of the new L’Astronomo’s P.2005/GLS movement is a day/night indicator which displays the phases of the moon, by means of a system consisting of two superimposed discs which rotate in combination.

The upper disc – which is read by a small external index fixed onto the movement – displays the 24 hours of the day, showing the sun during the hours of daylight and the stars of the sky at night. At the centre of the starry sky is a little round window through which the lower disc can be seen; on this appears the moon, its shape evolving day by day as a result of a small supplementary rotation of this disc of about 6.1° per day, a figure based on the exact duration of one lunar cycle (an average of 29 days, 12 hours, 44 minutes and 3 seconds).

Given that each watch movement is made according to the coordinates of a place chosen by the watch’s owner, the indication of the moon phases always relates to the sky above that place, and of course it also takes account of the difference between the earth’s northern and southern hemispheres.

Like the moon phase indicator, the indicators of sunrise and sunset times are connected to home time and therefore, if the owner of the watch should find himself in a city with a different time zone from that of the chosen city, these indicators will continue to show the situation at the time at home, which is indicated by the GMT hand.

Finally, at 6 o’clock is the linear indicator of the equation of time, which displays the difference between actual time (solar time) and conventional time on each day, this period ranging between plus 15 minutes and minus 15 minutes, according to the time of year.

As well as the moon phase indicator, the hand-wound P.2005/GLS calibre also has the characteristic Panerai tourbillon escapement, which can be admired both from the front as well as from the back of the watch thanks the sophisticated work of skeletonising the movement and the absence of an actual dial.

All the elements which would be found in a traditional dial appear on the movement or the flange, and the two spring barrels, which store enough power to last at least four days, are visible through the open back, which also enables the power reserve indicator mounted on the movement to be read.

In a watch with this construction, a date disc designed in the traditional way would to some extent conceal the fascination of the skeletonised movement, because it would cover part of the components. The Laboratorio di Idee at the Manufacture in Neuchâtel has therefore designed an innovative system – pending patent by Panerai – in which the date disc is made of borosilicate glass and the numbers of the days have laser-modified optical properties. The numbers are virtually invisible in all positions except for the one that is aligned with the little date window, where a further polarized crystal, situated above the date disc, causes the number to appear so that it is perfectly legible.

In the system patented by Panerai, the tourbillon’s rotation is different from that of the classic tourbillon. In fact, the cage of the balance rotates on an axis at right angles to the balance, not parallel with it. Also, while the traditional tourbillon rotates once in one minute, that of the P.2005/GLS rotates once in 30 seconds, and its rotation can be seen by an indicator in the small seconds counter at 9 o’clock.

The higher speed and the particular arrangement of the mechanism should result in more accurate timekeeping thanks to the compensation of possible alterations of rate.

As well as the technical personalisation of the P.2005/GLS movement, the new L’Astronomo Luminor 1950 Tourbillon Moon Phases Equation of Time GMT also provides the opportunity of selecting the material and finish of the case, the colour of the hands and that of the Super-LumiNova as well as the colour of the alligator strap.

The Officine Panerai L’Astronomo Luminor 1950 Tourbillon Moon Phases Equation of Time GMT Titanio 50 mm PAM920 is water-resistant to 10 bar (a depth of about 100 metres / 330 feet). panerai.com