Dedicated to Galileo Galilei and the first reference of the brand to feature a moon phase indication, the Panerai L’Astronomo Luminor 1950 is an exceptional Haute Horlogerie creation that was first introduced in 2018.
Pisa Circle - the digital platform for watch enthusiasts and collectors that we presented here - is currently offering a special version of this timepiece.
Combining a tourbillon with moon phase indication, equation of time, indication of sunrise and sunset, GMT function and a 4-day power reserve indicator, the Panerai L’Astronomo Luminor 1950 "Edizione Milano" is a unique piece with all its astronomical complications personalised to operate in accordance with the geographical coordinates of Milan, hence its name. Other details like the colour of the hands and the case finishes have been customised too.
All pictures in this article are © F.lli PISA srl
On the front side, 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 Milan, these indicators will continue to show the situation at the time at home, which is indicated by the GMT hand tipped with a triangular arrow.
At 6 o’clock we find 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.
On the back of the 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).
The tourbillon escapement 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.
Its 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 two spring barrels as well as the 4-day power reserve indicator are visible through the open back.
In order not to cover part of the components, 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 at 3 o'clock, where a further polarized crystal, situated above the date disc, causes the number to appear so that it is perfectly legible.