{"product_id":"arnold-son-astronomy-perpetual-moon-blue-dial-41-5-platinum-1glbx-u01a-c200x","title":"Arnold \u0026 Son Astronomy Perpetual Moon Blue Dial 41.5 Platinum - 1GLBX.U01A.C200X","description":"\u003cp\u003eA white mother-of-pearl star in a midnight-blue sky featuring a unique, Stellar Rays, motif as befits this astronomical complication. The astronomical moon phases showcase Arnold \u0026amp; Son's creativity and aesthetic flair. The lugs in the new Perpetual Moon 41.5's Platinum case have been redesigned to a tauter form of plunging bars with bevelled ends. \u003c\/p\u003e\n\u003cp\u003eRealistically depicted with hand-painted shadows, the large moon is enhanced with a luminescent material that is particularly intense in darkness yet invisible in daylight, giving way to the white mother-of-pearl disc. It is set against a blue PVD-treated grained sky and is surrounded by the constellations of the Big Dipper and Cassiopeia, also hand-painted and coated with Super-LumiNova.\u003c\/p\u003e\n\u003cp\u003eThe constellations have been chosen as a direct reference to John Arnold’s history as a maker of naval chronometers. The Big Dipper and Cassiopeia have been used by navigators in the northern hemisphere since time immemorial to find their bearings and locate the North Star (Polaris). The position of the latter defines the North and its angular altitude, or position in the North-South plane, and allows the distance to the equator, i.e., latitude, to be estimated.\u003c\/p\u003e\n\u003cp\u003eOn the case back, a secondary indicator allows the moon phase to be adjusted quickly and precisely. The hand-wound calibre that powers it, reference A\u0026amp;S1512, can track the development of its segments with exceptional precision. The duration of a complete lunar cycle is 29 days, 12 hours, 44 minutes and 2.8 seconds. Arnold \u0026amp; Son has succeeded in representing it in such a way that it would take 122 years for this movement, if regularly wound, to accumulate a day’s difference between its display and celestial reality.\u003c\/p\u003e\n\u003cp\u003eLike all Arnold \u0026amp; Son movements, the A\u0026amp;S1512 calibre has been entirely developed, manufactured, decorated, assembled, adjusted and cased at the Manufacture in La Chaux-de-Fonds. The calibre features two barrels and an oscillation frequency of 3 Hz, providing a power reserve of 90 hours.\u003c\/p\u003e\n\u003csection class=\"wp-block-wt-media-text alignfull has-medium-media-width has-media-on-the-right has-horizontal-padding-on-mobile has-white-color has-chronometry-gradient-background has-text-color has-background has-link-color wp-elements-9b25e8bcadd26c0594e3978bf1b8db0b\"\u003e\n\u003cdiv class=\"wp-block-wt-media-text__container\"\u003e\n\u003cfigure class=\"wp-block-wt-media-text__media\"\u003e\u003cpicture\u003e\u003csource sizes=\"30vw\" srcset=\"https:\/\/cdn.arnoldandson.com\/content\/uploads\/2024\/03\/08061428\/1NEASU01AK002S-Nebula-415-Steel-caseback.png?width=1028 1028w\" media=\"(min-width: 1536px) and (-webkit-min-device-pixel-ratio: 1.5)\"\u003e\u003csource sizes=\"30vw\" srcset=\"https:\/\/cdn.arnoldandson.com\/content\/uploads\/2024\/03\/08061428\/1NEASU01AK002S-Nebula-415-Steel-caseback.png?width=605 605w\" media=\"(min-width: 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