Longines Lindbergh Hour Angle 989.5215

Longines Lindbergh Hour Angle 989.5215

Basic Info Listing code : QD81M7 Brand : Longines Model : Lindbergh Hour Angle Reference number : 989.5215 Movement : Automatic Bracelet material : Steel Year of production : 1990 (Approximation) Condition : Used (Very good) Scope of delivery : Original box, no original papers Gender : Men's watch/Unisex Location : Romania Price : 1,700 Availability : Item is in stock Caliber Movement : Automatic Case Case diameter : 38 mm Bracelet/strap Bracelet material : Steel Bracelet color : Silver - Up for sale a collectible Longines Lindberg watch produced in the late 80s - diameter 38mm+crown - Silver dial with central inner bezel+stainless steel outer bezel, stainless steel case - original bracelet that covers up to 20cm wrists - last automatic movement produced by Longines from 1977 to the present in its own factory until the Quartz crisis, after they were forced to sell the patent to Lemania and rebranded by these under the name 8810 and 8815, being later used by Breguet in high end watches after Breguet acquired Lemania. - At the end of the 80s, in order to avoid bankruptcy, sales were decreasing, they switched to movements from other cheaper sources, e.g. ETA. - ETA mechanisms are well known mass-produced calibers. This version has the In-house movement. - It is in very good working condition,worn by rotation with other watches The watch comes together with travel pouch(box). Insured fast DHL/FedEx delivery upon request at around 50 euros extra cost. - The model presented was created by the famous American pilot Charles Lindbergh, who crossed the Atlantic from New York to Paris for the first time in history. - After returning to New York, he thought of creating this instrument watch that would facilitate the pilot's guidance in flight without communicating with those on the ground. - The Hour Angle complication indicates the geographical longitude of a point on Earth — that is, it is due west of the wearer — through an application used in early aviation and astronomical navigation. Operation on short: 1. The exact time of day (Greenwich Mean Time) is determined with great precision. This time is compared with the local solar time (determined by the position of the Sun or the stars). The difference between the two times is expressed in “hour angle” — each hour corresponds to 15° of longitude (360°/24h). In other words: > Hour angle = (Local time – Greenwich Mean Time) × 15° This is how you can find out your approximate longitude, if you have a precision chronometer and a sextant (for solar observation). Otherwise a fun watch to look at and own. By adjusting the bezel and reading the index on the dial, the pilot could directly read the hour angle of the Sun, which, together with the sextant data, gave the exact longitude. Sold as is.