Universal Time Universal Time (UT) is a time standard based on the rotation of the Earth. It is a modern continuation of Greenwich Mean Time (GMT), i.e., the mean solar time on the Prime Meridian at Greenwich, and GMT is sometimes used loosely as a synonym for UTC. In fact, the expression "Universal Time" is ambiguous (when accuracy of better than a few seconds is required), as there are several versions of it, the most commonly used being UTC and UT1 (see below). Universal Time and standard time Prior to the introduction of standard time, each municipality throughout the civilized world set its official clock, if it had one, according to the local position of the Sun (see solar time). Standard time zones of the world since September 20, 2011, instructions for converting UTC to or from local times are on the bottom, using addition or subtraction During the period between 1848 to 1972, all of the major countries adopted time zones based on the Greenwich meridian. Measurement Versions
Crab Nebula Chandra, Hubble, and Spitzer image NGC 1952 At X-ray and gamma ray energies above 30 keV, the Crab is generally the strongest persistent source in the sky, with measured flux extending to above 10 TeV. Located at a distance of about 6,500 light-years (2 kpc) from Earth, the nebula has a diameter of 11 light years (3.4 pc, corresponding to an apparent diameter of some 7 arc minutes) and expands at a rate of about 1,500 kilometers per second (0.5% c). At the center of the nebula lies the Crab Pulsar, a neutron star 28–30 km across with a spin rate of 30.2 times per second,  which emits pulses of radiation from gamma rays to radio waves. Origins and history of observation Reproduction of the drawing by Lord Rosse (1844), the first depiction of the nebula (color-inverted in order to appear white-on-black) The creation of the Crab Nebula corresponds to the bright SN 1054 supernova recorded by Chinese astronomers in AD 1054. Physical conditions The Crab Nebula video by NASA
Is the Universe a Holographic Reality? The Universe as a Hologram by Michael Talbot Does Objective Reality Exist, or is the Universe a Phantasm? In 1982 a remarkable event took place. At the University of Paris a research team led by physicist Alain Aspect performed what may turn out to be one of the most important experiments of the 20th century. You did not hear about it on the evening news. In fact, unless you are in the habit of reading scientific journals you probably have never even heard Aspect's name, though there are some who believe his discovery may change the face of science. Aspect and his team discovered that under certain circumstances subatomic particles such as electrons are able to instantaneously communicate with each other regardless of the distance separating them. University of London physicist David Bohm, for example, believes Aspect's findings imply that objective reality does not exist, that despite its apparent solidity the universe is at heart a phantasm, a gigantic and splendidly detailed hologram.
Erinyen Zwei Rachegöttinnen (Zeichnung aus dem 19. Jahrhundert nach einer antiken Vase) Die Erinyen oder Erinnyen ( griechisch Ἐρīνύς , Pl.: Ἐρινύες ) – bei den Griechen auch als Maniai , „die Rasenden“, später als Eumeniden (Εὐμενίδες), bei den Römern als Furien bezeichnet – sind in der griechischen Mythologie drei Rachegöttinnen: Alekto ( Ἀληκτώ ), „die (bei ihrer Jagd) Unaufhörliche“ Megaira ( Μέγαιρα , deutsch auch „Megäre“), „der neidische Zorn“. Im übertragenen Sinne wird ihr Name auch für eine böse, wütende Frau verwendet, eben für eine Furie (römisches Pendant einer Erinye). Sie stellen die personifizierten Gewissensbisse dar. Mythologischer Ursprung [ Bearbeiten ] Die Rachegöttin Tisiphone schwingt die Fackel des Wahnsinns und entleert den Krug mit Gift über das glückliche Königspaar Athamas und Ino .  ( Kupferstich von Bernard Picart , 18. Nach Hesiod wurden die Erinyen von Gaia geboren, nachdem der Titan Kronos seinen Vater Uranos mit einer Sichel entmannte. Literatur [ Bearbeiten ]
Taurus (constellation) Taurus is one of the constellations of the zodiac, which means it is crossed by the plane of the ecliptic. Its name is a Latin word meaning "bull", and its astrological symbol is a stylized bull's head: (Unicode ♉). Taurus is a large and prominent constellation in the northern hemisphere's winter sky. It is one of the oldest constellations, dating back to at least the Early Bronze Age when it marked the location of the Sun during the spring equinox. This constellation forms part of the zodiac, and hence is intersected by the ecliptic. The recommended three-letter abbreviation for the constellation, as adopted by the International Astronomical Union in 1922, is "Tau". The official constellation boundaries, as set by Eugène Delporte in 1930, are defined by a polygon of 26 segments. The constellation Taurus as it can be seen by the naked eye. The constellation lines have been added for clarity. A degree to the northwest of ζ Tauri is the Crab Nebula (M1), a supernova remnant.
Did Comet ISON survive? Scientists see tiny hope (Update) A comet that gained an earthly following because of its bright tail visible from space was initially declared dead after grazing the sun. Now, there is a sliver of hope that Comet ISON may have survived. New images being analyzed Friday showed a streak of light moving away from the sun that some said could indicate it wasn't game over just yet. "It certainly appears as if there is an object there that is emitting material," said Alan Fitzsimmons, an astronomer at Queens University in Belfast, Northern Ireland. Basically a dirty snowball from the fringes of the solar system, scientists had pronounced Comet ISON (EYE'-sahn) dead when it came within 1 million miles (1.6 million kilometers) of the sun Thursday. Some sky gazers speculated early on that it might become the comet of the century because of its brightness, although expectations dimmed over time. Two years ago, a smaller comet, Lovejoy, grazed the sun and survived, but fell apart a couple of days later.
Proper motion Relation between proper motion and velocity components of an object. At emission, the object was at distance d from the Sun, and moved at angular rate μ radian/s, that is, μ = vt / d with vt = velocity transverse to line of sight from the Sun. (The diagram illustrates an angle μ swept out in unit time at tangential velocity vt.) Introduction This motion is caused by the true movement of the stars relative to the Sun and solar system through space. The Sun travels in a nearly circular orbit (the solar circle) about the center of the Milky Way at a speed of about 220 km/s at a radius of 8 ± 0.65 kpc from the center, which can be taken as the rate of rotation of the Milky Way itself at this radius. The proper motion is measured by two quantities: the position angle and the proper motion itself. Proper motion may also be given by the angular changes per year in the right ascension (μα) and declination (μδ). where δ is the declination. Usefulness in astronomy
The Stellar Sisters Happy Matariki everyone! It’s that time of the year when we approach the shortest day and Matariki appears low in the East in our morning sky just before the sunrise. To find it follow the line of the stars from Orion’s belt (Tautoru in Maori) towards the North – past a red star (Aldebaran) and to a small clump of stars; the “Eyes of God” or Matariki. Matariki as seen by Spitzer Space Telescope Depending on eyesight and viewing conditions people are usually able to make out between 7 and 14 stars within this cluster with the naked eye, although in reality there are over 1000 members. Known as the Pleiades, the daughters of the titan Atlas in greek folklore and as Subaru in Japan, this cluster is almost always associated with celebrations of rebirth and regeneration, most likely due to its appearance’s proximity to the Northern solstice (shortest day), when the tide of Winter turns and we begin to move towards warmer months once again. Main Matariki stars So why do I include this?
Geologic Clock Helps Scientists Determine Moon's Age | Space Exploration Planetary researchers headed by Dr Seth Jacobson from the Observatory de la Cote d’Azur in Nice, France, say they have determined that the Moon formed nearly 100 million years after the start of the Solar System. Moon. Image credit: Luc Viatour. Dr Jacobson with colleagues simulated the growth of Mercury, Venus, Earth and Mars from a disk of thousands of planetary building blocks orbiting the Sun. By analyzing the growth history of the Earth-like planets from 259 simulations, they discovered a relationship between the time the Earth was impacted by a Mars-sized object to create the Moon and the amount of material added to the Earth after that impact. Augmenting the computer simulation with details on the mass of material added to the Earth by accretion after the formation of the Moon revealed a relationship that works much like a clock to date the Moon-forming event. “We were excited to find a ‘clock’ for the formation time of the Moon that didn’t rely on radiometric dating methods.
Schiefer In der wissenschaftlichen Literatur wird das Wort Schiefer (ahd. scivaro, mhd. schiver(e) ‚Steinsplitter‘, ‚Holzsplitter‘; mittelniederdeutsch schiver ‚Schiefer‘, ‚Schindel‘) ohne weitere Zusätze nicht mehr als Gesteinsname verwendet. Schieferarten[Bearbeiten] Schiefer aus der Gruppe der undeformierten Sedimentgesteine[Bearbeiten] Tonschiefer[Bearbeiten] Tonschiefer aus dem südlichen Ural mit einer von rechts oben nach links unten verlaufenden Schieferung; Rasterelektronenmikroskop-Aufnahme. Tonschiefer aus dem südlichen Ural. Kristalline Schiefer[Bearbeiten] Geologisch handelt es sich bei diesen Schiefern (engl. schist) um metamorphe Gesteine (z. Dach- und Fassadenschiefer als Werkstein[Bearbeiten] Abbautechnik[Bearbeiten] Historisches Dachschieferbergwerk – Grube Hoffnung Grubenwanderweg – Alte Bergwerksstollen (Vogelsberg 1) Schieferdach In der Übertagefertigung übernimmt zunächst eine Diamantsäge die erste Bearbeitung der Schieferblöcke. Schiefer aus Deutschland[Bearbeiten] Museen[Bearbeiten]
The Hunter and the Bull My astronomy posts are based on what I talk about each week at Carter Observatory during planetarium shows and telescope viewing sessions. Much of the information is gleaned from the monthly summaries provided by the excellent Alan Gilmore at the University of Cantebury’s Mt John Observatory which can be accessed (for April) here: Personally I remember the main stars, and their colours an then use imaginary lines to navigate the sky, unfortunately this is not particularly well facilitated by the currently available star chats (which are still great though), visible on the right, so I will be editing small portions of the star charts, to allow colour comparison and for general ’prettyness’ (and also to teach myself Inkscape – BTW if you would like to similarly learn here‘s a nice place to start!) Orion’s Belt is a great way to navigate and memorize his part of the sky. Taurus, the Bull Crab Nebula (M1) - False Coloured image
NASA Hack Space | SpaceRef Great Moonbuggy Race Winners NASA today declared the winners of the first NASA Human Exploration Rover Challenge, held April 11-12 at the U.S. Space & Rocket Center in Huntsville, Ala. Help Rescue The ISEE-3 Spacecraft And Put It Back to Work ISEE-3 Reboot Project (IRP): Our plan is simple: we intend to contact the ISEE-3 (International Sun-Earth Explorer) spacecraft, command it to fire its engine and enter an orbit near Earth, and then resume its original mission - a mission it began in 1978. Hyperspectral Imaging by CubeSats A new hyperspectral camera able to fit in the palm of a hand, compact enough to fly on CubeSat-sized missions, is being developed by ESA. 2014 Spin Your Thesis! Five student teams have been selected for the 2014 Spin Your Thesis! NASA's Human Exploration Research Analog If two is company and three is a crowd, what is four - especially when you are living and working in close quarters and under stress for several days? NIST Chips Help BICEP2 Telescope Legs For Robotnaut 2