The Sky Perceptions of the Sky
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1 The Sky Perceptions of the Sky An Observer-Centered Hemisphere Night & Day - Black & Blue - Stars & Sun Atmospheric & Astronomical Phenomena Weather, Clouds, Rainbows,... versus Sun, Moon, Stars, Planets,... and Comets & Zodiacal Light; Meteors & Aurorae The Sky in History The Sky as Real: The Firmament & Crystalline Spheres The Sky as a Construct: Direction & Distance
2 Orientation & Nomenclature Zenith & Nadir The Astronomical Horizon The Meridian (AM & PM) The Cardinal Directions (N,E,S,W) Pointing at the Sky: Azimuth & Elevation Angles
3 The Celestial Sphere Motions on the Sky Diurnal Motions of the Sun, Moon, And Stars The Solar, Lunar, and Sidereal Days Relative Motions of the Sun, Moon, & Stars Defining the Celestial Sphere The Celestial Sphere is Defined by the Fixed Stars Fixed Stars: Appearance, Brightness, and Color Patterns: Asterisms and Constellations The (Apparent) Rotation of the Celestial Sphere The Sidereal Day of 23h 56m 04s The Celestial Poles and the Celestial Equator Orientation, Time, and Latitude
4 The Orientation of the Celestial Sphere Geography: The Celestial Sphere on the Observer s Sky North & South: The Orientation of the Celestial Poles East & West: The Celestial Equator and the Horizon
5 The Apparent Rotation of the Celestial Sphere The Sidereal Day is 23h 56m 04s Rising (E) & Setting (W) of the Stars: Circumpolar Stars
6 Hourly Changes in the Appearance of the Nighttime Sky N N S S 6:00 PM 8:00 PM 2007 JANUARY JANUARY 15
7 Motions of Objects on the Celestial Sphere Remember: The Fixed Stars are Fixed The Wanderers: The Seven Planetes or Luminaries 1. The Sun: The Sun s Annual Motion on the Ecliptic The Sidereal Year 2. The Moon: The Moon s Monthly Path on the Celestial Sphere The Sidereal Month 3-7. The Classical Planets: Direct & Retrograde Motions The Sidereal Periods of the Planets: Mercury, Venus, Mars, Jupiter, Saturn (and later: Uranus, Neptune, and Pluto*) * as well as Comets, Asteroids, Trans-Neptunian Objects, Kuiper Belt Objects, plus fixed objects such as nebulae, galaxies,...
8 The Ecliptic The Sun Moves Eastward along a Path Called the Ecliptic
9 The Sun on the Ecliptic The Sun always moves Eastward along a path called the Ecliptic (Note: 24h 00m 00s is the average length of the Solar Day.) The Ecliptic is inclined 23.4 with respect to the Celestial Equator (The Obliquity of the Ecliptic ) It Completes a Circuit of the Ecliptic in One Sidereal Year (One Sidereal Year is days) The Sun crosses the Celestial Equator at/on the Equinoxes Vernal (Spring*) Equinox (S to N) on about 21 March Autumnal Equinox (N to S) on about 23 September...and is most distant from the Celestial Equator at/on the Solstices Summer Solstice (Farthest North) on about 21 June Winter Solstice (Farthest South) on about 22 December *...the seasonal references are for the Northern Hemisphere!
10 Sunlight and Season The location of the Sun on the Ecliptic determines: Where on the horizon the Sun rises and sets...if it does either! The length of the day and the length of the night, plus The height of the noontime Sun above the horizon...and therefore the warmth of the season. Which part of the Celestial Sphere is visible at night...and which part is invisible in daylight. Note: Again, it is the obliquity of the ecliptic which is responsible for the occurrence of seasons on Earth. Our varying distance from the Sun has almost no seasonal effect; indeed, the Earth is nearest to the Sun in January.
11 Seasonal Changes in the Appearance of the Nighttime Sky N N S S 15 JULY JANUARY :00 PM 8:00 PM
12 Resumé The Sky The Visible Hemisphere Zenith & Nadir; Horizon & Meridian Cardinal Directions The Celestial Sphere Fixed Stars & Luminaries Celestial Poles & Celestial Equator Orientation & Apparent Rotation Time & Geography The Ecliptic The Annual Path of the Sun on the Celestial Sphere Motions of the Sun on the Celestial Sphere Equinoxes & Solstices The Sun and Seasons
13 Next: The Moon and the Planets
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Lecture Outline Chapter 0 Charting the Heavens Earth is average we don t occupy any special place in the universe Universe: Totality of all space, time, matter, and energy Astronomy: Study of the universe
Name: Exam 1, 9/30/05
Multiple Choice: Select the choice that best answers each question. Write your choice in the blank next to each number. (2 points each) 1. At the North Pole in mid-november, the sun rises at a. North of