Understanding Golden Hour, Blue Hour and Twilights
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
View and Print This Publication
@ SOUTHWEST FOREST SERVICE Forest and R U. S.DEPARTMENT OF AGRICULTURE P.0. BOX 245, BERKELEY, CALIFORNIA 94701 Experime Computation of times of sunrise, sunset, and twilight in or near mountainous terrain Bill 6. Ryan Times of sunrise and sunset at specific mountain- ous locations often are important influences on for- estry operations. The change of heating of slopes and terrain at sunrise and sunset affects temperature, air density, and wind. The times of the changes in heat- ing are related to the times of reversal of slope and valley flows, surfacing of strong winds aloft, and the USDA Forest Service penetration inland of the sea breeze. The times when Research NO& PSW- 322 these meteorological reactions occur must be known 1977 if we are to predict fire behavior, smolce dispersion and trajectory, fallout patterns of airborne seeding and spraying, and prescribed burn results. ICnowledge of times of different levels of illumination, such as the beginning and ending of twilight, is necessary for scheduling operations or recreational endeavors that require natural light. The times of sunrise, sunset, and twilight at any particular location depend on such factors as latitude, longitude, time of year, elevation, and heights of the surrounding terrain. Use of the tables (such as The 1 Air Almanac1) to determine times is inconvenient Ryan, Bill C. because each table is applicable to only one location. 1977. Computation of times of sunrise, sunset, and hvilight in or near mountainous tersain. USDA Different tables are needed for each location and Forest Serv. Res. Note PSW-322, 4 p. Pacific corrections must then be made to the tables to ac- Southwest Forest and Range Exp. -
Starry Starry Night Part 1
Starry Starry Night Part 1 DO NOT WRITE ON THIS PORTION OF THE TEST 1. If a lunar eclipse occurs tonight, when is the soonest a solar eclipse can occur? A) Tomorrow B) In two weeks C) In six months D) In one year 2. The visible surface of the Sun is called its A) corona B) photosphere C) chromosphere D) atmosphere 3. Which moon in the Solar System has lakes and rivers on it: A) Triton B) Charon C) Titan D) Europa 4. The sixth planet from the Sun is: A) Mars B) Jupiter C) Saturn D) Uranus 5. The orbits of the planets and dwarf planets around the Sun are in the shape of: A) An eclipse B) A circle C) An ellipse D) None of the above 6. True or False: During the summer and winter solstices, nighttime and daytime are of equal length. 7. The diameter of the observable universe is estimated to be A) 93 billion miles B) 93 billion astronomical units C) 93 billion light years D) 93 trillion miles 8. Asteroids in the same orbit as Jupiter -- in front and behind it -- are called: A) Greeks B) Centaurs C) Trojans D) Kuiper Belt Objects 9. Saturn's rings are made mostly of: A) Methane ice B) Water ice C) Ammonia ice D) Ice cream 10. The highest volcano in the Solar System is on: A) Earth B) Venus C) Mars D) Io 11. The area in the Solar System just beyond the orbit of Neptune populated by icy bodies is called A) The asteroid belt B) The Oort cloud C) The Kuiper Belt D) None of the above 12. -
Conspicuity of High-Visibility Safety Apparel During Civil Twilight
UMTRI-2006-13 JUNE 2006 CONSPICUITY OF HIGH-VISIBILITY SAFETY APPAREL DURING CIVIL TWILIGHT JAMES R. SAYER MARY LYNN MEFFORD CONSPICUITY OF HIGH-VISIBILITY SAFETY APPAREL DURING CIVIL TWILIGHT James R. Sayer Mary Lynn Mefford The University of Michigan Transportation Research Institute Ann Arbor, MI 48109-2150 U.S.A. Report No. UMTRI-2006-13 June 2006 Technical Report Documentation Page 1. Report No. 2. Government Accession No. 3. Recipient’s Catalog No. UMTRI-2006-13 4. Title and Subtitle 5. Report Date Conspicuity of High-Visibility Safety Apparel During Civil June 2006 Twilight 6. Performing Organization Code 302753 7. Author(s) 8. Performing Organization Report No. Sayer, J.R. and Mefford, M.L. UMTRI-2006-13 9. Performing Organization Name and Address 10. Work Unit no. (TRAIS) The University of Michigan Transportation Research Institute 11. Contract or Grant No. 2901 Baxter Road Ann Arbor, Michigan 48109-2150 U.S.A. 12. Sponsoring Agency Name and Address 13. Type of Report and Period Covered The University of Michigan Industry Affiliation Program for 14. Sponsoring Agency Code Human Factors in Transportation Safety 15. Supplementary Notes The Affiliation Program currently includes Alps Automotive/Alpine Electronics, Autoliv, Avery Dennison, Bendix, BMW, Bosch, Com-Corp Industries, DaimlerChrysler, DBM Reflex, Decoma Autosystems, Denso, Federal-Mogul, Ford, GE, General Motors, Gentex, Grote Industries, Guide Corporation, Hella, Honda, Ichikoh Industries, Koito Manufacturing, Lang- Mekra North America, Magna Donnelly, Muth, Nissan, North American Lighting, Northrop Grumman, OSRAM Sylvania, Philips Lighting, Renault, Schefenacker International, Sisecam, SL Corporation, Stanley Electric, Toyota Technical Center, USA, Truck-Lite, Valeo, Visteon, 3M Personal Safety Products and 3M Traffic Safety Systems Information about the Affiliation Program is available at: http://www.umich.edu/~industry 16. -
Chapter 19 the Almanacs
CHAPTER 19 THE ALMANACS PURPOSE OF ALMANACS 1900. Introduction The Air Almanac was originally intended for air navigators, but is used today mostly by a segment of the Celestial navigation requires accurate predictions of the maritime community. In general, the information is similar to geographic positions of the celestial bodies observed. These the Nautical Almanac, but is given to a precision of 1' of arc predictions are available from three almanacs published and 1 second of time, at intervals of 10 minutes (values for annually by the United States Naval Observatory and H. M. the Sun and Aries are given to a precision of 0.1'). This Nautical Almanac Office, Royal Greenwich Observatory. publication is suitable for ordinary navigation at sea, but The Astronomical Almanac precisely tabulates celestial lacks the precision of the Nautical Almanac, and provides data for the exacting requirements found in several scientific GHA and declination for only the 57 commonly used fields. Its precision is far greater than that required by navigation stars. celestial navigation. Even if the Astronomical Almanac is The Multi-Year Interactive Computer Almanac used for celestial navigation, it will not necessarily result in (MICA) is a computerized almanac produced by the U.S. more accurate fixes due to the limitations of other aspects of Naval Observatory. This and other web-based calculators are the celestial navigation process. available from: http://aa.usno.navy.mil. The Navy’s The Nautical Almanac contains the astronomical STELLA program, found aboard all seagoing naval vessels, information specifically needed by marine navigators. contains an interactive almanac as well. -
How the Sun Paints the Sky the Generation of Its Colour and Luminosity Bob Fosbury European Southern Observatory and University College London
How the Sun Paints the Sky The generation of its colour and luminosity Bob Fosbury European Southern Observatory and University College London Introduction: the 19th century context — science and painting The appearance of a brilliantly clear night sky must surely have stimulated the curiosity of our earliest ancestors and provided them with the foundation upon which their descendants built the entire edifice of science. This is a conclusion that would be dramatically affirmed if any one of us were to look upwards in clear weather from a location that is not polluted by artificial light: an increasingly rare possibility now, but one that provides a welcome regeneration of the sense of wonder. What happened when our ancient ancestors gazed instead at the sky in daylight or twilight? It is difficult to gauge from written evidence as there was such variation in the language of description among different cultures (see “Sky in a bottle” by Peter Pesic. MIT Press, 2005. ISBN 0-262-16234-2). The blue colour of a cloudless sky was described in a remarkable variety of language, but the question of its cause most often remained in the realm of a superior being. Its nature did concern the Greek philosophers but they appeared to describe surfaces and objects in the language of texture rather than colour: they did not have a word for blue. It was only during the last millennium that thinkers really tried to get to grips with the problem, with Leonardo da Vinci, Isaac Newton and Johann Wolfgang von Goethe all applying themselves. It was not easy however, and no real progress was made until the mid-19th century when there was a focus of the greatest scientific minds of the time on the problem of both the colour and the what was then the novel property of polarisation of the light. -
Good Morning, Good Afternoon, and Good Evening to All of Our Participants Around the World
>>>Good morning, good afternoon, and good evening to all of our participants around the world. Welcome to this Webinar sponsored by the international forum for investor education, IFIE and America's chapter of how an investor's complaint can be used to further investor educational goals. You will be hearing from two presenters today, Kattia Castro Cruz and Pierino Stucchi. Before we introduce Kattia Castro Cruz as your moderator I want to explain how the Q&A answer will work. During the question period, to ask a question type the name of your organization and your question into the question box on your Webinar dashboard. This is located towards the bottom of the screen. We often have more questions than we have time to answer. We will try to answer all of the questions that we receive through the Webinar or we will post them after the Webinar event. Thank you again, and I will ask our facilitator leader, Kattia Castro Cruz, to take over. >> Thank you, Katherine, good morning, good afternoon, and good night to all the participants around the world. Welcome to this Webinar that is sponsored by the international forum for investor education IFIE and the America's chapter. Today we have two conferences, and we will have time for questions and answers at the end of the presentation. During the session of questions and answers, to make a question, just put your name, type your name into, and your organization name and then you will have time at the end. It's on the bottom of the right hand screen. -
Dark Model Adaptation: Semantic Image Segmentation from Daytime to Nighttime
Dark Model Adaptation: Semantic Image Segmentation from Daytime to Nighttime Dengxin Dai1 and Luc Van Gool1;2 Abstract— This work addresses the problem of semantic also under these adverse conditions. In this work, we focus image segmentation of nighttime scenes. Although considerable on semantic object recognition for nighttime driving scenes. progress has been made in semantic image segmentation, it Robust object recognition using visible light cameras is mainly related to daytime scenarios. This paper proposes a novel method to progressive adapt the semantic models trained remains a difficult problem. This is because the structural, on daytime scenes, along with large-scale annotations therein, textural and/or color features needed for object recognition to nighttime scenes via the bridge of twilight time — the time sometimes do not exist or highly disbursed by artificial lights, between dawn and sunrise, or between sunset and dusk. The to the point where it is difficult to recognize the objects goal of the method is to alleviate the cost of human annotation even for human. The problem is further compounded by for nighttime images by transferring knowledge from standard daytime conditions. In addition to the method, a new dataset camera noise [32] and motion blur. Due to this reason, of road scenes is compiled; it consists of 35,000 images ranging there are systems using far-infrared (FIR) cameras instead from daytime to twilight time and to nighttime. Also, a subset of the widely used visible light cameras for nighttime scene of the nighttime images are densely annotated for method understanding [31], [11]. Far-infrared (FIR) cameras can be evaluation. -
Midnight Sun and Northern Lights Name
volume 3 Midnight Sun and issue 5 Northern Lights It’s black, which absorbs the sun’s warmth. In fact, polar midnight, bears feel hot if the temperature rises above freezing. but the sun The polar nights are long and dark, but sometimes is shining there’s a light show in the sky. The northern lights, which brightly. Where are called the aurora, are often green or pink. They seem are you? You’re to wave and dance in the sky. Auroras are caused by gas in the Arctic, particles that were thrown off by the sun. These particles near the North collide in Earth’s atmosphere and make a beautiful show. Pole. During Few people live in the Arctic because it’s so cold, but the arctic Canada, Greenland, Norway, Iceland, and Russia are summer, the good places to see the midnight sun and the aurora. In ©2010 by Asbjørn Floden in Flickr. Some rights reserved http://creativecommons.org/licenses/by-nc/2.0/deed.en sun doesn’t fact, Norway is often called the Land of the Midnight set for months. Instead, it goes around the horizon. You Sun. could read outside at midnight. As you travel south The temperature stays warm, too, although not as from the North Pole, warm as where you live. The average temperature in there is less midnight sun the summer near the North Pole is about 32 degrees, and fewer northern lights. or freezing. That may sound cold to you, but it’s warm It gets warmer, too. Soon, in the Arctic. -
Iceland Panorama
Iceland Panorama August 5th - 12th 2018 From steamy hot springs to top-notch spas, spectacular scenery to magnificent art museums, this unique land is the perfect place to relax, recharge, and explore. Legends say that the ancient gods themselves guided Iceland’s first settler, Ingolfur Arnarson, to make his home in Reykjavik (“Smoky Bay”), named after the geothermal steam he saw. Today this geothermal energy heats homes and outdoor swimming pools throughout the city – a pollution-free energy source that leaves the air outstandingly fresh, clean and clear. Renowned for its spellbinding beauty and stunning landscape, Iceland is the only place on Earth where you can stand on top of the Atlantic Ocean’s submarine mountain chain - for the island is the only place where the chain peaks up above sea level! From this perch, we can walk from North America to Europe. We’ll journey through the north, south, and west of the island, enjoying the long evening twilight of the northern summer and visit a wondrous variety of small settlements, good-size towns and amazing natural landscapes. This captivating geological wonderland offers the opportunity to explore dramatic phenomena: colossal glaciers, active volcanoes, geysers, hot springs, glacial rivers, cascading waterfalls, moss-covered lava fields, and glacial lagoons. We’ll dine on Icelandic specialties, including seafood, ocean-fresh from the morning’s catch; highland lamb; and unusual varieties of game. It’s purely natural food imaginatively served. The cost of this itinerary, per person, double occupancy is: Join a Tufts faculty host and specially selected local guide, Boston Departure $3990 Svanur Thorkelsson on an amazing adventure this summer Land only (no airfare included) $3290 to the Land of Fire and Ice. -
ESSENTIALS of METEOROLOGY (7Th Ed.) GLOSSARY
ESSENTIALS OF METEOROLOGY (7th ed.) GLOSSARY Chapter 1 Aerosols Tiny suspended solid particles (dust, smoke, etc.) or liquid droplets that enter the atmosphere from either natural or human (anthropogenic) sources, such as the burning of fossil fuels. Sulfur-containing fossil fuels, such as coal, produce sulfate aerosols. Air density The ratio of the mass of a substance to the volume occupied by it. Air density is usually expressed as g/cm3 or kg/m3. Also See Density. Air pressure The pressure exerted by the mass of air above a given point, usually expressed in millibars (mb), inches of (atmospheric mercury (Hg) or in hectopascals (hPa). pressure) Atmosphere The envelope of gases that surround a planet and are held to it by the planet's gravitational attraction. The earth's atmosphere is mainly nitrogen and oxygen. Carbon dioxide (CO2) A colorless, odorless gas whose concentration is about 0.039 percent (390 ppm) in a volume of air near sea level. It is a selective absorber of infrared radiation and, consequently, it is important in the earth's atmospheric greenhouse effect. Solid CO2 is called dry ice. Climate The accumulation of daily and seasonal weather events over a long period of time. Front The transition zone between two distinct air masses. Hurricane A tropical cyclone having winds in excess of 64 knots (74 mi/hr). Ionosphere An electrified region of the upper atmosphere where fairly large concentrations of ions and free electrons exist. Lapse rate The rate at which an atmospheric variable (usually temperature) decreases with height. (See Environmental lapse rate.) Mesosphere The atmospheric layer between the stratosphere and the thermosphere. -
Shadows of Venus 29 November 2005
Shadows of Venus 29 November 2005 he continues, "I found myself in Sir Patrick's home. The conversation turned to things that had never been photographed. He told me that there were few, if any, decent photographs of a shadow caused by the light from Venus. So the challenge was set." On Nov. 18, Lawrence took his own young boys, Richard (age 14) and Douglas (age 12), to a beach near their home. "There was no ambient lighting, no moon, no manmade lights, only Venus and the stars. It was the perfect venue to make my attempt." On that night, and again two nights later, they photographed shadows of their camera's tripod, shadows of patterns cut from cardboard, and The planet Venus is growing so bright, it's shadows of the boy's hands--all by the light of actually casting shadows. Venus. It's often said (by astronomers) that Venus is bright The shadows were very delicate, "the slightest enough to cast shadows. So where are they? Few movement destroyed their distinct sharpness. It is people have ever seen a Venus shadow. But difficult," he adds, "for a cold human being to stand they're there, elusive and delicate--and, if you still long enough for the amount of time needed to appreciate rare things, a thrill to witness. Attention, catch the faint Venusian shadow." thrill-seekers: Venus is reaching its peak brightness for 2005 and casting its very best Difficult, yes, but worth the effort, he says. After all, shadows right now. how many people have seen themselves silhouetted by the light of another planet? Image: Richard and Douglas Lawrence make hand shadows using the light of Venus. -
Midnight Sun, Part II by PA Lassiter
Midnight Sun, Part II by PA Lassiter . N.B. These chapters are based on characters created by Stephenie Meyer in Twilight, the novel. The title used here, Midnight Sun, some of the chapter titles, and all the non-interior dialogue between Edward and Bella are copyright Stephenie Meyer. The first half of Ms. Meyer’s rough-draft novel, of which this is a continuation, can be found at her website here: http://www.stepheniemeyer.com/pdf/midnightsun_partial_draft4.pdf 12. COMPLICATIONSPart B It was well after midnight when I found myself slipping through Bella’s window. This was becoming a habit that, in the light of day, I knew I should attempt to curb. But after nighttime fell and I had huntedfor though these visits might be irresponsible, I was determined they not be recklessall of my resolve quickly faded. There she lay, the sheet and blanket coiled around her restless body, her feet bound up outside the covers. I inhaled deeply through my nose, welcoming the searing pain that coursed down my throat. As always, Bella’s bedroom was warm and humid and saturated with her scent. Venom flowed into my mouth and my muscles tensed in readiness. But for what? Could I ever train my body to give up this devilish reaction to my beloved’s smell? I feared not. Cautiously, I held my breath and moved to her bedside. I untangled the bedclothes and spread them carefully over her again. She twitched suddenly, her legs scissoring as she rolled to her other side. I froze. “Edward,” she breathed.