![]() ![]() All Celestials bear the Geneva seal - testament to the state of the art manifested in each watch. All steel components are bevelled and polished reducing friction at wheel contact points thereby improving precision. The 301 individual watch parts are hand finished. One crown at 2 o'clock winds the watch and sets the time, the other at 4 o'clock sets the astronomical indications.Įach watch takes approximately 18 months to complete, and about 35 examples are produced annually. The moon phase is accurate to 6.51 seconds per lunation. The sidereal day is accurate to 0.088 seconds per sidereal day, 32,139 seconds per year, or 53 minutes and 33.9 seconds per century. Just how accurate is this watch? The lunar day is accurate to 0.05 seconds per day, 18.385 seconds per year, or 30 minutes and 38.5 seconds per century. To create a watch that accurately measures moon-phase and solar time, the master watchmakers at Patek Philippe used sophisticated computerization to produce the single precise ratio out of 25 trillion ratio combinations. #Night sky northern hemisphere skychart full#The waxing and waning of the moon is shown on a secondary dial, displaying both lunation - the time between two full moons, which is on average 29 days, 12 hours, 44 minutes and 2.82 seconds - and the lunar day - the time between two passages of the moon across its meridian, being 24 hours, 50 minutes and 28,328 seconds.Ĭelestial timepieces have been produced for some time, but none so accurate as the Patek Philippe Celestial. The sidereal day of 23 hours, 56 minutes and 4.09892 seconds is measured by the passage of the fixed star Sirius (indicated on the dial via a special arrow). The night sky of the Northern Hemisphere rotates counter-clockwise showing the passage of the sky relative to the meridian of Sirius (the brightest star second only to our own Sun). Three separate sapphire crystal discs rotate around the dial. The central elipse frames the angular part of the sky visible at lattitude 46'20''. Sans-serif roman numerals and direction markers. Microscopically accurate star field disc. ![]() Skeletonized white-lacquered gold feuille hands. Watch dial shows the sky visible from Geneva. Virgo - the maiden, very low in the west is the second largest constellation in the sky and one of the two in which the ecliptic and celestial equator cross. This one marks the current position of the September equinox. It is home to a cluster of galaxies of which M87 is the largest at around 60 million light years with a central black hole at least 7 billion times the mass of the Sun. It has one bright star, the 16th brightest in the night sky, Spica which is about 250 light years away. Like most stars, it is a binary.Caseband (side of case) decorated with halved Calatrava crosses. What's in the sky this September? ConstellationsĬonstellations represent groups of stars that have been given a name and more recently, a border. For millennia they have been used as a tool to share significant cultural stories, events and as markers. Today, the 88 western constellations that trace their roots to the ancient middle east are used here help astronomers map the sky and search for astronomical objects. This September these constellations dominate the spring sky: Monthly sky maps from the 2021 Australasian Sky Guide published by MAAS Media. ![]()
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