# 6102P-001 reference and fidelity boundary

Official reference: https://www.patek.com/en/collection/grand-complications/6102P-001

Public exterior dimensions: 44 mm, 10.58 mm. Platinum case, two crowns, pointer date, blue northern sky and moon display, exhibition back and 22K micro-rotor. Installed movement orientation follows the complete caseback photograph, not the inverted standalone movement photograph.

The movement is an original ideal kinematic design inspired by public 240 LU CL C specifications: 3 Hz, one barrel, 48-hour maximum reserve, unidirectional winding. Manufacturer pivot positions, inaccessible gearing, escapement and internal dimensions have not been established from engineering drawings. Individual GenericGear contact artifacts are verified; this alone is not validation of the whole assembled movement. Clutches, calendar and crown correctors are consumer mechanisms, not SDK constraint outputs. Geometric and browser verification are recorded separately in evidence.

The 356-tooth sky wheel and 279-tooth Moon wheel follow the public user manual. Their complete driving trains are original. Mean sidereal period: 18839520000/218647 seconds. Mean lunar day: 339738300/3799 seconds. Mean Moon phase is geared from their solar/lunar relative angle. Initial mean position uses the system instant once, Geneva longitude 6.1432° E, and a NASA new-moon epoch (2001-01-24 13:07 UT). Subsequent motion never resynchronizes to system time. This is not a precision ephemeris; it excludes orbital irregularities, nutation, precession and refraction. The user manual's printed 28-day lunation is inconsistent with the established 29.53-day mean and is not adopted.

Star positions: derived from David Nash / Astronexus HYG Database v4.1, CC BY-SA 4.0. The filtered derivative is included as reference/stars.json with the license in reference/HYG-LICENSE.txt. Derived star geometry remains under that license. Official photographs are reference only and are not embedded as textures.

References:
- https://patek-res.cloudinary.com/dfsmedia/0906caea301d42b3b8bd23bd656d1711/191210-source/options/download/panoplie-6102p-001-en.pdf
- https://aa.usno.navy.mil/faq/GAST
- https://eclipse.gsfc.nasa.gov/phase/phase2001gmt.html
- https://github.com/astronexus/HYG-Database

Candidate 5172G remains available for a later model; it is not replaced or implemented by this work.