Observational Astronomy Star Charts
... sky by its altitude (a) above the horizon... ...and by its angular distance from the northmost point on our horizon, i.e. its azimuth (A) ... ...both measured in degrees. ...
... sky by its altitude (a) above the horizon... ...and by its angular distance from the northmost point on our horizon, i.e. its azimuth (A) ... ...both measured in degrees. ...
Density, Mass and Surface Area
... density. The old ‘trick question” goes: which weighs more, a pound of feathers or a pound of bricks? The clever student will respond: neither, they both weigh a pound, that is, they have the same mass. But suppose you were asked simply which weighs more, feathers or bricks? What you really mean is t ...
... density. The old ‘trick question” goes: which weighs more, a pound of feathers or a pound of bricks? The clever student will respond: neither, they both weigh a pound, that is, they have the same mass. But suppose you were asked simply which weighs more, feathers or bricks? What you really mean is t ...
celestial equator
... If we draw a line from the zenith through a celestial object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the w ...
... If we draw a line from the zenith through a celestial object and extend that line to the horizon, we obtain the azimuth angle of the object. By convention, the north point on the horizon has azimuth 0 degrees, the east point has azimuth 90 degrees, the south point has azimuth 180 degrees, and the w ...
CHAPTER 1
... 3. In summer, the Sun reaches a point higher in the sky, than in winter. This results in each portion of the Earth’s surface receiving more energy in a given amount of time in the summer than in winter. Also, sunlight passes through more atmosphere in winter than in summer, resulting in more scatter ...
... 3. In summer, the Sun reaches a point higher in the sky, than in winter. This results in each portion of the Earth’s surface receiving more energy in a given amount of time in the summer than in winter. Also, sunlight passes through more atmosphere in winter than in summer, resulting in more scatter ...
How many moons does Mercury have? (Update)
... Also known as a Roche sphere, a Hill sphere is a region around an astronomical body where it To break it all down, there are three ways in which dominates the attraction of satellites. The outer a body can acquire a natural satellite. These edge of this region constitutes a zero-velocity causes have ...
... Also known as a Roche sphere, a Hill sphere is a region around an astronomical body where it To break it all down, there are three ways in which dominates the attraction of satellites. The outer a body can acquire a natural satellite. These edge of this region constitutes a zero-velocity causes have ...
Lecture - Faculty
... • North Point - the point that is on the horizon and directly North • Zenith - the point directly above • Nadir - the point directly below • Meridian - the great circle that passes from the North point through the zenith to the South Point ...
... • North Point - the point that is on the horizon and directly North • Zenith - the point directly above • Nadir - the point directly below • Meridian - the great circle that passes from the North point through the zenith to the South Point ...
The Night Sky
... Annual motion of the stars The same stars are not visible all year long. Any given non-circumpolar star will set 4 minutes early each day until it becomes lost in the glare of the setting Sun. ...
... Annual motion of the stars The same stars are not visible all year long. Any given non-circumpolar star will set 4 minutes early each day until it becomes lost in the glare of the setting Sun. ...
Name - MIT
... C) The force of attraction between any two objects decreases with the square of the distance between their centers. D) As a planet moves around its orbit, it sweeps out equal areas in equal times. E) A planet or comet in a non-circular orbit travels faster when it is nearer to the Sun and slower whe ...
... C) The force of attraction between any two objects decreases with the square of the distance between their centers. D) As a planet moves around its orbit, it sweeps out equal areas in equal times. E) A planet or comet in a non-circular orbit travels faster when it is nearer to the Sun and slower whe ...
Astronomy_Main_Lesson_Book_Contents
... vii. The Celestial Meridian b. Two systems for mapping the heavens (diagram, define and explain) i. Objective, observer independent (useful at any time and place) 1. Right ascension (and relation to Earthly Longitude) 2. Declination (and relation to Earthly Latitude) ii. Subjective, observer depende ...
... vii. The Celestial Meridian b. Two systems for mapping the heavens (diagram, define and explain) i. Objective, observer independent (useful at any time and place) 1. Right ascension (and relation to Earthly Longitude) 2. Declination (and relation to Earthly Latitude) ii. Subjective, observer depende ...
PowerPoint Presentation - Planetary Configurations
... • Sunlight is absorbed by the curved Earth • A bundle of light strikes falls across much land at the poles; the same amount of light (and energy) is concentrated into less land at the equator. • Whether Earth is tilted toward or away from the Sun changes how a bundle of light is concentrated on land ...
... • Sunlight is absorbed by the curved Earth • A bundle of light strikes falls across much land at the poles; the same amount of light (and energy) is concentrated into less land at the equator. • Whether Earth is tilted toward or away from the Sun changes how a bundle of light is concentrated on land ...
Apparent Motions of Celestial Objects
... The sun’s altitude at noon is highest during the year. The sun’s “apparent path” across the sky is at its longest (greater than 12 hours). ...
... The sun’s altitude at noon is highest during the year. The sun’s “apparent path” across the sky is at its longest (greater than 12 hours). ...
Greek Astronomy - Galileo and Einstein
... Crystal Spheres: Plato, Eudoxus, Aristotle Plato, with his belief that the world was constructed with geometric simplicity and elegance, felt certain that the sun, moon and planets, being made of aither, would have a natural circular motion, since that is the simplest uniform motion that repeats its ...
... Crystal Spheres: Plato, Eudoxus, Aristotle Plato, with his belief that the world was constructed with geometric simplicity and elegance, felt certain that the sun, moon and planets, being made of aither, would have a natural circular motion, since that is the simplest uniform motion that repeats its ...
Introduction to Astronomy (high school)
... an imaginary circle around the sky directly above the Earth's equator. It is always 90 degrees from the poles. All the stars rotate in a path that is parallel to the celestial equator. The celestial equator intercepts the horizon at the points directly east and west anywhere on the Earth. ...
... an imaginary circle around the sky directly above the Earth's equator. It is always 90 degrees from the poles. All the stars rotate in a path that is parallel to the celestial equator. The celestial equator intercepts the horizon at the points directly east and west anywhere on the Earth. ...
January 14 - Astronomy
... Why is summer warmer? 1. The Sun, being above the celestial equator, remains in the sky longer during the summer, the longest daylight time occurring on the summer solstice. 2. The Sun rays hit the earth more directly during the summer months, i.e. the ...
... Why is summer warmer? 1. The Sun, being above the celestial equator, remains in the sky longer during the summer, the longest daylight time occurring on the summer solstice. 2. The Sun rays hit the earth more directly during the summer months, i.e. the ...
Astronomy 103 Announcements
... This effect was first observed by the Greek astronomer Hipparchus (in about 150 BC). He saw the position of the stars on the same day of the year had changed slightly over the 50 years he had made observations. ...
... This effect was first observed by the Greek astronomer Hipparchus (in about 150 BC). He saw the position of the stars on the same day of the year had changed slightly over the 50 years he had made observations. ...
Astronomy
... 2. ______ The celestial equator always crosses the horizon at the north point and south point. 3. ______ The celestial equator always passes directly overhead to those that live on the equator. 4. ______ A first magnitude star in Orion is brighter than a second magnitude star in Ursa Major. 5. _____ ...
... 2. ______ The celestial equator always crosses the horizon at the north point and south point. 3. ______ The celestial equator always passes directly overhead to those that live on the equator. 4. ______ A first magnitude star in Orion is brighter than a second magnitude star in Ursa Major. 5. _____ ...
Introducing Astronomy
... “Longitude” is measured as Right Ascension, or the amount of time taken from the Vernal Equinox “Latitude” is measured as Declination, a positive (above) or negative (below) degree from the Celestial Equator (CEq) ...
... “Longitude” is measured as Right Ascension, or the amount of time taken from the Vernal Equinox “Latitude” is measured as Declination, a positive (above) or negative (below) degree from the Celestial Equator (CEq) ...
Astronomy 111 Overview of the Solar system
... show that any specific star will cross directly overhead (on the meridian) about four minutes earlier every day. In other words, the day according to the stars (the sidereal day) is about four minutes shorter than the day according to the sun (the solar day). If we measure a day from noon to noon - ...
... show that any specific star will cross directly overhead (on the meridian) about four minutes earlier every day. In other words, the day according to the stars (the sidereal day) is about four minutes shorter than the day according to the sun (the solar day). If we measure a day from noon to noon - ...
Telling Time by the Sun - Cornell Astronomy
... 2. The Earth revolves around the Sun once every ~365 days (year). 3. The Moon revolves around the Earth once every ~28 days (month). 4. The orbital planes of objects in the Solar System lie (almost) in the equatorial planes of the major body (but not quite; there are a few exceptions) 5. The Earth’s ...
... 2. The Earth revolves around the Sun once every ~365 days (year). 3. The Moon revolves around the Earth once every ~28 days (month). 4. The orbital planes of objects in the Solar System lie (almost) in the equatorial planes of the major body (but not quite; there are a few exceptions) 5. The Earth’s ...
+ RA(*)
... bright star Thuban near 2700 BC, when the pyramids were built, and was once near Vega, a name that means “fallen.” ...
... bright star Thuban near 2700 BC, when the pyramids were built, and was once near Vega, a name that means “fallen.” ...
Lecture Two (Powerpoint format)
... sun is the center of the universe. 4….the distance from the earth to the sun is imperceptible in comparison with the height of the firmament. 5.Whatever motion appears in the firmament arises not from any motion of the firmament, but from the earth's motion. 6.What appear to us as motions of the sun ...
... sun is the center of the universe. 4….the distance from the earth to the sun is imperceptible in comparison with the height of the firmament. 5.Whatever motion appears in the firmament arises not from any motion of the firmament, but from the earth's motion. 6.What appear to us as motions of the sun ...
Armillary sphere
An armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (in the celestial sphere), consisting of a spherical framework of rings, centred on Earth or the Sun, that represent lines of celestial longitude and latitude and other astronomically important features such as the ecliptic. As such, it differs from a celestial globe, which is a smooth sphere whose principal purpose is to map the constellations.With the Earth as center, an armillary sphere is known as Ptolemaic. With the sun as center, it is known as Copernican.