GEOCENTRIC AND HELIOCENTRIC MODELS
... Back to Calculations… As we touched on previously, astronomers have developed convenient units of measure to accommodate and reduce large distances to manageable numbers. Interstellar (distances between the stars) are measured using the light-year (l.y.). Since light travels about 9.5 trillion km pe ...
... Back to Calculations… As we touched on previously, astronomers have developed convenient units of measure to accommodate and reduce large distances to manageable numbers. Interstellar (distances between the stars) are measured using the light-year (l.y.). Since light travels about 9.5 trillion km pe ...
Study Guide for 1ST Astronomy Exam
... Describe the location of sunrise and sunset along the horizon for any given day of the year. (Figure 7.1) Describe how the maximum altitude of the Sun depends on day of the year. Fig 7.1) Explain why the solar day is different from the sidereal day. (Fig 7.2) Describe how day length varies d ...
... Describe the location of sunrise and sunset along the horizon for any given day of the year. (Figure 7.1) Describe how the maximum altitude of the Sun depends on day of the year. Fig 7.1) Explain why the solar day is different from the sidereal day. (Fig 7.2) Describe how day length varies d ...
Early history of astronomy
... • The motion of a body, such as a planet or moon, along a path around some point in space • Earth's orbit is elliptical • Earth is closest to the Sun (perihelion) in January • Earth is farthest from the Sun (aphelion) in July • The plane of the ecliptic is an imaginary plane that connects Earth's or ...
... • The motion of a body, such as a planet or moon, along a path around some point in space • Earth's orbit is elliptical • Earth is closest to the Sun (perihelion) in January • Earth is farthest from the Sun (aphelion) in July • The plane of the ecliptic is an imaginary plane that connects Earth's or ...
lecture4
... Newton's First Law of Motion Every object continues in a state of rest or a state of uniform motion in a straight line unless acted on by a force. ● Inertia - resistance to change in motion of object - is related to its mass. ...
... Newton's First Law of Motion Every object continues in a state of rest or a state of uniform motion in a straight line unless acted on by a force. ● Inertia - resistance to change in motion of object - is related to its mass. ...
Linking Asteroids and Meteorites through Reflectance
... • If Earth orbited the Sun, ancient astronomers believed that they would see differences in angular separation of stars as the Earth rotated around the Sun • Since they saw no changes in angular separation of the stars, they assumed the Earth was the center of the universe • They could not fathom th ...
... • If Earth orbited the Sun, ancient astronomers believed that they would see differences in angular separation of stars as the Earth rotated around the Sun • Since they saw no changes in angular separation of the stars, they assumed the Earth was the center of the universe • They could not fathom th ...
Second Lecture - University of Maryland Astronomy
... The Copernican Principle : The Earth is not at a special location in the Universe. Later, we will come across the Generalized Copernican Principle: There is no special place in the universe, i.e., the universe has no center. ...
... The Copernican Principle : The Earth is not at a special location in the Universe. Later, we will come across the Generalized Copernican Principle: There is no special place in the universe, i.e., the universe has no center. ...
Objection (Parallax)
... Once the size of the Earth was determined (later) new calculations were made that were remarkably accurate ...
... Once the size of the Earth was determined (later) new calculations were made that were remarkably accurate ...
Linking Asteroids and Meteorites through Reflectance
... • If Earth orbited the Sun, ancient astronomers believed that they would see differences in angular separation of stars as the Earth rotated around the Sun • Since they saw no changes in angular separation of the stars, they assumed the Earth was the center of the universe • They could not fathom th ...
... • If Earth orbited the Sun, ancient astronomers believed that they would see differences in angular separation of stars as the Earth rotated around the Sun • Since they saw no changes in angular separation of the stars, they assumed the Earth was the center of the universe • They could not fathom th ...
1_Introduction - Department of Astronomy
... meters, astronomical units, and parsecs. Distance from Earth to Sun = 150 billion meters = 1.5 X 1011 meters = 1 astronomical unit (AU) ...
... meters, astronomical units, and parsecs. Distance from Earth to Sun = 150 billion meters = 1.5 X 1011 meters = 1 astronomical unit (AU) ...
History of astronomy
... (Mercury) to the slowest (Saturn) and placed the Sun at the center of the solar system. The retrograde motion was easily explained by this reordering. The Earth was “demoted” from the center of the world. It was just one of the planets. ...
... (Mercury) to the slowest (Saturn) and placed the Sun at the center of the solar system. The retrograde motion was easily explained by this reordering. The Earth was “demoted” from the center of the world. It was just one of the planets. ...
chart_set_2 - Physics and Astronomy
... Ancient Greek astronomers knew of Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn. Aristotle vs. Aristarchus (3rd century B.C.): ...
... Ancient Greek astronomers knew of Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn. Aristotle vs. Aristarchus (3rd century B.C.): ...
8th Grade - Astronomy
... not time. Example: Our next nearest star neighbor is Proxima Centauri which is 4.2 light-years from Earth. (p. 602) The apparent change in position of an object when seen from different places Astronomers use parallax to measure distances to nearby stars by measuring the Parallax apparent movement o ...
... not time. Example: Our next nearest star neighbor is Proxima Centauri which is 4.2 light-years from Earth. (p. 602) The apparent change in position of an object when seen from different places Astronomers use parallax to measure distances to nearby stars by measuring the Parallax apparent movement o ...
Heliocentric Model by Copernicus
... • Kepler’s the law of planetary motion are a landmark in astronomy • They made it possible to calculate the motions of planets with better accuracy than any geocentric model ever had • They passed the test of Occam’s razor • They helped to justify the idea of heliocentric models ...
... • Kepler’s the law of planetary motion are a landmark in astronomy • They made it possible to calculate the motions of planets with better accuracy than any geocentric model ever had • They passed the test of Occam’s razor • They helped to justify the idea of heliocentric models ...
Lecture 8 Ptolemy
... The planets move through the stars from west to east along the ecliptic, like the Sun but at different rates, e.g., Mars takes 2 years, Jupiter takes 12. This motion east is not uniform; the speed varies. Sometimes planets even reverse direction and go west for a while; this is called retrograde mot ...
... The planets move through the stars from west to east along the ecliptic, like the Sun but at different rates, e.g., Mars takes 2 years, Jupiter takes 12. This motion east is not uniform; the speed varies. Sometimes planets even reverse direction and go west for a while; this is called retrograde mot ...
Lecture 17 Ptolemy on the Motion of the Earth
... The planets move through the stars from west to east along the ecliptic, like the Sun but at different rates, e.g., Mars takes 2 years, Jupiter takes 12. This motion east is not uniform; the speed varies. Sometimes planets even reverse direction and go west for a while; this is called retrograde mot ...
... The planets move through the stars from west to east along the ecliptic, like the Sun but at different rates, e.g., Mars takes 2 years, Jupiter takes 12. This motion east is not uniform; the speed varies. Sometimes planets even reverse direction and go west for a while; this is called retrograde mot ...
Revolutions of Earth
... Certainly no one today doubts that Earth orbits a star, the Sun. Photos taken from space, observations made by astronauts, and the fact that there has been so much successful space exploration that depends on understanding the structure of the solar system all confirm it. But in the early 17th centu ...
... Certainly no one today doubts that Earth orbits a star, the Sun. Photos taken from space, observations made by astronauts, and the fact that there has been so much successful space exploration that depends on understanding the structure of the solar system all confirm it. But in the early 17th centu ...
ASTRO OTTER JUNIOR
... of the planets in our solar system can be seen in the night sky. TEKS: Gr. 1-1.8B, Gr. 2-2.8D Rotation and revolution ...
... of the planets in our solar system can be seen in the night sky. TEKS: Gr. 1-1.8B, Gr. 2-2.8D Rotation and revolution ...
Earth Science – Quiz 2
... b. the appearance of forward motion of a planet in the sky c. the appearance of a motionless planet d. the appearance of backward motion of a planet in the sky 3. Stellar parallax shows an observer a. that stars are stationary. b. the apparent displacement of background stars as the earth orbits the ...
... b. the appearance of forward motion of a planet in the sky c. the appearance of a motionless planet d. the appearance of backward motion of a planet in the sky 3. Stellar parallax shows an observer a. that stars are stationary. b. the apparent displacement of background stars as the earth orbits the ...
Topic 2 Booster PP - AstronomyGCSE.co.uk
... Copernicus first suggested a heliocentric model of the solar system ...
... Copernicus first suggested a heliocentric model of the solar system ...
Tycho Brahe & Johannes Kepler
... Tycho Brahe’s Discoveries • As a young man he proved that comets had to be farther from Earth than the Moon. • He also proved that a star which appeared to brighten dramatically over a few weeks was also beyond the Moon. • Both observations showed that the heavens could change like the Earth. • He ...
... Tycho Brahe’s Discoveries • As a young man he proved that comets had to be farther from Earth than the Moon. • He also proved that a star which appeared to brighten dramatically over a few weeks was also beyond the Moon. • Both observations showed that the heavens could change like the Earth. • He ...
Document
... b. Where are we in the Universe? c. Difficulties Studying Astronomy d. Scientific Method e. Theories f. S. I. System g. Metric Prefixes h. Conversion Factors i. Scientific Notation j. Astronomical Units (AU) k. When is Now? l. History of the Universe m. Why Study Astronomy ...
... b. Where are we in the Universe? c. Difficulties Studying Astronomy d. Scientific Method e. Theories f. S. I. System g. Metric Prefixes h. Conversion Factors i. Scientific Notation j. Astronomical Units (AU) k. When is Now? l. History of the Universe m. Why Study Astronomy ...
Ancient Astronomy
... objects farther away than the Moon were celestial (therefore perfect) and could not change. • was given an island to encourage his continuing his work in Denmark. • built large metallic measuring instruments and measured positions of stars and planets with greater accuracy than his predecessors. • p ...
... objects farther away than the Moon were celestial (therefore perfect) and could not change. • was given an island to encourage his continuing his work in Denmark. • built large metallic measuring instruments and measured positions of stars and planets with greater accuracy than his predecessors. • p ...
List of Illustrations
... Invention of the vacuum tube – ‘Cathode rays’ and ‘canal rays’ – William Crookes: the Crookes tube and the corpuscular interpretation of cathode rays – Cathode rays are shown to move far slower than light – The discovery of the electron – Wilhelm Röntgen & the discovery of X-rays – Radioactivity; Be ...
... Invention of the vacuum tube – ‘Cathode rays’ and ‘canal rays’ – William Crookes: the Crookes tube and the corpuscular interpretation of cathode rays – Cathode rays are shown to move far slower than light – The discovery of the electron – Wilhelm Röntgen & the discovery of X-rays – Radioactivity; Be ...
Quiz 1 Review, Astronomy 1144 - astronomy.ohio
... • What is stellar parallax? Why is it useful? 1. Stellar parallax is the apparent change in the position of stars brought about by the motion of the Earth around the Sun. 2. It can be used to determine the absolute distance to stars. • Why did the Greeks reject the heliocentric model? 1. They could ...
... • What is stellar parallax? Why is it useful? 1. Stellar parallax is the apparent change in the position of stars brought about by the motion of the Earth around the Sun. 2. It can be used to determine the absolute distance to stars. • Why did the Greeks reject the heliocentric model? 1. They could ...
File
... Ex/ Binaries; _______-Charon C. Satellites 1. ___________ velocity (~7.9 km/s, or 18,000 mph) ...
... Ex/ Binaries; _______-Charon C. Satellites 1. ___________ velocity (~7.9 km/s, or 18,000 mph) ...
Copernican heliocentrism
Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. It positioned the Sun near the center of the Universe, motionless, with Earth and the other planets rotating around it in circular paths modified by epicycles and at uniform speeds. The Copernican model departed from the Ptolemaic system that prevailed in Western culture for centuries, placing Earth at the center of the Universe, and is often regarded as the launching point to modern astronomy and the Scientific Revolution.Copernicus was aware that the ancient Greek Aristarchus had already proposed a heliocentric theory, and cited him as a proponent of it in a reference that was deleted before publication, but there is no evidence that Copernicus had knowledge of, or access to, the specific details of Aristarchus' theory. Although he had circulated an outline of his own heliocentric theory to colleagues sometime before 1514, he did not decide to publish it until he was urged to do so late in his life by his pupil Rheticus. Copernicus's challenge was to present a practical alternative to the Ptolemaic model by more elegantly and accurately determining the length of a solar year while preserving the metaphysical implications of a mathematically ordered cosmos. Thus his heliocentric model retained several of the Ptolemaic elements causing the inaccuracies, such as the planets' circular orbits, epicycles, and uniform speeds, while at the same time re-introducing such innovations as,Earth is one of several planets revolving around a stationary Sun in a determined orderEarth has three motions: daily rotation, annual revolution, and annual tilting of its axisRetrograde motion of the planets is explained by Earth's motionDistance from Earth to the Sun is small compared to the distance to the stars.↑ 1.0 1.1 ↑