Described by one journalist as perhaps the most accurate moon phase available, we are proud to share with you the newest addition to the ochs line, the moon phase or selene. The ochs line moon phase or selene comes in the exclusive ochs blue with rhodium-plated markers, hour and minute hands, and full moon. The new moon is patina. The second hand is ochs blue.
Ludwig Oechslin’s ochs und junior moon phase / selene is perhaps one of his most recognizable designs. An astronomical time machine that provides not only the time, but the date and the phases of the moon.
The ochs und junior moon phase / selene calculates the lunation as 29.5306122449 days. As a result, it will provide the correct length of the phases of the moon for 3,478.27 years before it is off by a single day. This means that you can pretty much set your moon phase one time, and it will be accurate for as long as you own it – providing that you keep it wound.
Less is more
A moon phase watch, by definition, is complicated. But Ludwig Oechslin has always taken a different approach. While a typical moon phase complication is made up of countless pieces, the ochs line selene / moon phase module requires just 5 additional parts.
Innovative timekeeping priced within reach –
One of Dr. Oechslin’s biggest goals has always been to offer his innovative watches at a more accessible price. The ochs line moon phase or selene is available for pre-order at:
CHF 5,500 – Incl. 7.7% Swiss VAT
CHF 5,077 – Export price.
Estimated shipping in 12-16 weeks.
Summary & overview
Ludwig Oechslin’s moon phase watch displays the time, the date, and of course the phases of the moon. It features a unique moon phase function executed as a 5-part epicyclic gear system module that will be accurate for 3,478.27 years before its calculation will be off by 1 day. The analogue, spiral “dot date” indicator offers a better visual que than a digital display from the same distance, and brings the date in visual harmony with the clockwise display of the hours and minutes.
Moon phase
The center represents the earth and the large dot at 12 o’clock represents the sun. The full moon is when the moon is opposite the sun and earth at 6 o’clock. The new moon is when the moon is hidden between the sun and the earth at 12 o’clock. The new moon is represented by a dark circle at 6 o’clock.
Date
The 30+1 holes around the perimeter of the dial dis play the date. The 10 minute markers serve as reference points. For example: the marker indicating 30 minutes also shows the 15th day of the month (30÷2=15). These 5-day markers allow for the date to be eas ily read at a glance. While it is a departure from a typical date function, reading it becomes intuitive after a short time.
Time
The exact minute and second can be read using the date holes , which are spaced at 2-minute intervals. The holes mark even minutes, and the gaps indicate odd minutes. The holes and gaps are the same width as the minute hand.
Mechanics
How does Ludwig Oechslin’s moon phase work?
An epicyclic gear train driven by a central finger bonded directly to the hour pipe turns the lunar disk beneath the dial counter-clockwise. The central finger engages with a wheel bearing 12 teeth, whose pinion with 14 teeth meshes with a wheel bearing 18 teeth, whose pinion with 14 teeth meshes with the fixed recessed ring gear with its 109 teeth machined into the underside of the dial (annotated diagram).
What is the benefit of a highly precise moon phase calculation?
The average time between two identical moon phases is 29.530589 days. Most moon phase watchesapproximate a lunation as 29.5 days, which leads their calculation to be off by 1 day after 2 years. The closer your moon phase calculation comes to the average lunation of 29.530589 days, the “flatter” the difference between your prediction and the actual moon phase. The ochs und junior moon phase calculates the lunation as 29.5306122449 days. As a result, it will predict the moon phase correctly for 3,478.27 years before it is off by 1 day. This means that you only have to set your moon phase once, and you can trust that it will accurately display the phases of the moon.
Overview
Ludwig Oechslin’s moon phase watch displays the phases of the moon, the date, and the time. It features a unique moon phase function ex ecuted as a 5-par t epicyclic gear system module that will be accurate for 3,478.27 years before its calculation will be off by 1 day. The analogue, spiral “dot date” indicator offers a better visual que than a digital display from the same distance and brings the date in visual harmony with the clockwise display of the hours and minutes.
ochs und junior ochs line moon phase or selene Technical Specifications
Movement
- Base movement ETA 2824-2 with 38 hours of power reserve.
- Manufacturer: ETA SA / Grenchen / Switzerland.Moon phase function 5-part epicyclic gear system designed by Ludwig Oechslin.
- The calculation is precise for 3,478.27 years before it will be off by one day.
- Date function 30 + 1 hole date spiral with 5-minute markers that serve as reference points designed by Ludwig Oechslin.
Case & Dial
- Dimensions 42mm x 11mm (incl. crystal)
- 39mm x 11mm
- Weight 42mm titanium: 70g (incl. leather strap and buckle)
- 39mm titanium: 62g
- Water Resistance: 100m in titanium.
- Case 2-part case in grade 5 titanium designed by Ludwig Oechslin.
- Crown Screw-down crown in grade 5 titanium designed by Ludwig Oechslin
- (39mm and 42mm). Manufacturer: Pibor SA / Glovelier / Switzerland.
- Buckle Designed by Ludwig Oechslin for 22mm watch s traps with no loops.
- Visible machining marks. Grade 5 titanium.
- Crystal Sapphire crystal.
- Superluminova in blue RC TRITEC in Teufen / Switzerland,
- application by Monyco in La Chaux-de-Fonds / Switzerland.
- Swiss Made The ochs und junior moon phase watch is entirely manufactured in
Strap
- Ecopell Enzian leather strap handmade by Sabina Brägger.
Switzerland. Each watch is hand-assembled and regulated at the ochs und junior workshop in La Chaux-de-Fonds. Warranty Two years.
Order
Orders can be placed by e-mail to oj@ochsundjunior.ch or directly on the homepage www.ochsundjunior.swiss
Delivery is estimated for 12-16 weeks from order.
Order with a 50 % prepayment in accordance with the ochs und junior standard guidelines: Payment via stripe (homepage), via credit card (saferpay-link) or via bank transfer to our bank account:
Credit Suisse AG, Schwanenplatz 8 CH-6002 Lucerne
ochs und junior AG
IBAN: CH31 0483 5039 2684 4100 0
Clearing No. 4835
Swift: CRESCHZZ80A
Account No. 0463-392684-41
