The Moon
... • Why do we see phases of the Moon? – Half the Moon is lit by the Sun; half is in shadow, and its appearance to us is determined by the relative positions of Sun, Moon, and Earth during the Moon's orbit. • What causes eclipses? – Lunar eclipse: Earth’s shadow on the Moon – Solar eclipse: Moon’s shad ...
... • Why do we see phases of the Moon? – Half the Moon is lit by the Sun; half is in shadow, and its appearance to us is determined by the relative positions of Sun, Moon, and Earth during the Moon's orbit. • What causes eclipses? – Lunar eclipse: Earth’s shadow on the Moon – Solar eclipse: Moon’s shad ...
The Pennsylvanian Period in Alabama: Looking Up Astronomy and
... one must observe it with telescopes sensitive to longer wavelengths of light. The Galactic center is important because all objects in the disk of the Milky Way rotate around that point. If the Milky Way could be seen from the outside, it might resemble the galaxy shown in Fig. 8.2, bottom., known as ...
... one must observe it with telescopes sensitive to longer wavelengths of light. The Galactic center is important because all objects in the disk of the Milky Way rotate around that point. If the Milky Way could be seen from the outside, it might resemble the galaxy shown in Fig. 8.2, bottom., known as ...
Chapter 8: The Pennsylvanian Period in Alabama: Looking Up
... past. Both also involve processes that occur over time-spans much longer than a human lifetime. Walking the rock piles of the Minkin Paleozoic Footprint site, and seeing fossils of animals or plants that lived hundreds of millions of years ago, is like looking at a galaxy hundreds of millions of lig ...
... past. Both also involve processes that occur over time-spans much longer than a human lifetime. Walking the rock piles of the Minkin Paleozoic Footprint site, and seeing fossils of animals or plants that lived hundreds of millions of years ago, is like looking at a galaxy hundreds of millions of lig ...
ASTRONOMICAL REFERENCE SYSTEMS AND FRAMES
... P A. Celestial reference system ‚ serves to describe positions and motions of celestial bodies; it should be inertial in Newtonian sense, i.e., such that Newton laws hold in it; it is fixed with respect to the rest of universe - it should be nonrotating, its origin having ...
... P A. Celestial reference system ‚ serves to describe positions and motions of celestial bodies; it should be inertial in Newtonian sense, i.e., such that Newton laws hold in it; it is fixed with respect to the rest of universe - it should be nonrotating, its origin having ...
CH3.Ast1001.F13.EDS
... The geocentric model is useless for predicting planetary positions in the sky, whereas even the earliest Sun-centered models worked almost perfectly. ...
... The geocentric model is useless for predicting planetary positions in the sky, whereas even the earliest Sun-centered models worked almost perfectly. ...
Chapter 3 The Science of Astronomy In what ways do all humans
... • How did Copernicus, Tycho, and Kepler challenge the Earth-centered idea? • What are Kepler’s three laws of planetary ...
... • How did Copernicus, Tycho, and Kepler challenge the Earth-centered idea? • What are Kepler’s three laws of planetary ...
Notes for Class 5, February 16
... Slide 27 from Class 3 • Hellenistic Period (after 323 BC) o Ptolemy (2nd cent AD) used new tools to simplify geocentric model of heavens • Epicycle (small sphere moved on larger sphere, planet on small sphere) • Eccentrics (circle displaced from earth) • Equant – point from which planet appeared to ...
... Slide 27 from Class 3 • Hellenistic Period (after 323 BC) o Ptolemy (2nd cent AD) used new tools to simplify geocentric model of heavens • Epicycle (small sphere moved on larger sphere, planet on small sphere) • Eccentrics (circle displaced from earth) • Equant – point from which planet appeared to ...
Lecture 1: Observations of planetary systems
... The initial RV detections were all massive (∼MJup ) planets in short-period (< 5 day) orbits, and these are usually referred to as “hot Jupiters”. Their existence presented an immediate challenge to our understanding of planet formation (as they exist well inside the radius at which solids would sub ...
... The initial RV detections were all massive (∼MJup ) planets in short-period (< 5 day) orbits, and these are usually referred to as “hot Jupiters”. Their existence presented an immediate challenge to our understanding of planet formation (as they exist well inside the radius at which solids would sub ...
Word Doc - CAASTRO
... A force of attraction between two objects due to their mass An area of the Solar System beyond Neptune that is believed to contain many comets and other icy objects, plus three officially recognised dwarf planets: Pluto, Haumea, and Makemake ...
... A force of attraction between two objects due to their mass An area of the Solar System beyond Neptune that is believed to contain many comets and other icy objects, plus three officially recognised dwarf planets: Pluto, Haumea, and Makemake ...
TWO DIFFERENT ALTITUDES
... 14. A navigational instrument made from a quarter (1/4) circle protractor is a _________. 15. A ___________measures altitude from ___° at the _______ to ___ ° at the _______. 16. The vertical angle of an object from the horizon is the ____________. 17. The horizontal angle of an object clockwise fro ...
... 14. A navigational instrument made from a quarter (1/4) circle protractor is a _________. 15. A ___________measures altitude from ___° at the _______ to ___ ° at the _______. 16. The vertical angle of an object from the horizon is the ____________. 17. The horizontal angle of an object clockwise fro ...
Lecture 9 - Notes on Galileo
... fact, and saying “It would be a terrible detriment for the souls if people found themselves convinced by proof of something it was made then a sin to believe.” Cardinal Robert Bellarmine was the chief theologian of the Church, who took an instrumentalist view of the question, saying that mathematic ...
... fact, and saying “It would be a terrible detriment for the souls if people found themselves convinced by proof of something it was made then a sin to believe.” Cardinal Robert Bellarmine was the chief theologian of the Church, who took an instrumentalist view of the question, saying that mathematic ...
1 NOTES ON GALILEO Galileo was born in Pisa of the famous
... fact, and saying “It would be a terrible detriment for the souls if people found themselves convinced by proof of something it was made then a sin to believe.” Cardinal Robert Bellarmine was the chief theologian of the Church, who took an instrumentalist view of the question, saying that mathematic ...
... fact, and saying “It would be a terrible detriment for the souls if people found themselves convinced by proof of something it was made then a sin to believe.” Cardinal Robert Bellarmine was the chief theologian of the Church, who took an instrumentalist view of the question, saying that mathematic ...
DP11 Foundations of Astronomy
... Gravitational contraction? If the Sun were contracting under its own gravity, this contraction would release energy. This idea was proposed by Lord Kelvin and Hermann von Helmholtz. Helmholtz's calculations showed that the contraction could have started at most 25 million years ago. At around the sa ...
... Gravitational contraction? If the Sun were contracting under its own gravity, this contraction would release energy. This idea was proposed by Lord Kelvin and Hermann von Helmholtz. Helmholtz's calculations showed that the contraction could have started at most 25 million years ago. At around the sa ...
The Solar System Interplanetary Matter and the Birth of the Planets
... The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace (40 years later). During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with an ...
... The idea that the solar system was born from the collapse of a cloud of dust and gas for proposed by Immanuel Kant (1755) and by Pierre Simon Laplace (40 years later). During the first part of the 20th century, some proposed that the solar system was the result of a near collision of the Sun with an ...
Grade 5 ELA Life on a New Planet
... would have much more luck on one of these planets than on the other planets. Jupiter, Saturn, Uranus, and Neptune are often called the "gas giants." It is easy to see how they earned this name. Each of these planets is many, many times larger than the Earth. In addition, they are not made of solid r ...
... would have much more luck on one of these planets than on the other planets. Jupiter, Saturn, Uranus, and Neptune are often called the "gas giants." It is easy to see how they earned this name. Each of these planets is many, many times larger than the Earth. In addition, they are not made of solid r ...
Armillary Sphere (1:1)
... The day at noon with the longest shadow is the winter solstice while the one with the shortest shadow is the summer solstice. However, this only applies to the regions to the north of the Tropic of Cancer. The day with the shortest shadow does not fall on the summer solstice for places located south ...
... The day at noon with the longest shadow is the winter solstice while the one with the shortest shadow is the summer solstice. However, this only applies to the regions to the north of the Tropic of Cancer. The day with the shortest shadow does not fall on the summer solstice for places located south ...
THE ROTATION OF THE SUN
... II) Venus in the sky. As Venus is closer to the Sun (like Mercury), we can observe it just only a little time after sunset (“evening star”) or a little time before sunrise (“morning star”). That planet, when visible, is always very bright due to its proximity of the Earth and also because Venus is s ...
... II) Venus in the sky. As Venus is closer to the Sun (like Mercury), we can observe it just only a little time after sunset (“evening star”) or a little time before sunrise (“morning star”). That planet, when visible, is always very bright due to its proximity of the Earth and also because Venus is s ...
601aristotle2
... Most people in Aristotle’s time believed the earth was flat, but he did not agree. The Greek thinker realized that a lunar eclipse occurred when the earth came between the sun and the moon. The shape of the earth’s shadow, Aristotle realized, was round. If the earth were flat, its shadow would have ...
... Most people in Aristotle’s time believed the earth was flat, but he did not agree. The Greek thinker realized that a lunar eclipse occurred when the earth came between the sun and the moon. The shape of the earth’s shadow, Aristotle realized, was round. If the earth were flat, its shadow would have ...
Wonderworld of Space
... on topics generated by the myths. P10 Comets A passage about comets is followed by four questions in which students provide full-sentence answers. P11 Our Moon A research sheet covering Moon facts, Moon missions, Moon walkers and Moon mountains. P12 Space Puzzle This worksheet contains 9 words to un ...
... on topics generated by the myths. P10 Comets A passage about comets is followed by four questions in which students provide full-sentence answers. P11 Our Moon A research sheet covering Moon facts, Moon missions, Moon walkers and Moon mountains. P12 Space Puzzle This worksheet contains 9 words to un ...
Thinking Outside the Sphere
... Hipparchus, Ptolemy developed an intricate system to account for the retrograde motion of the planets. In his scheme, each planet was attached to a small circle, called an epicycle, which moved it in a small orbit. The epicycle was attached in turn to a larger circle, or deferent, which moved around ...
... Hipparchus, Ptolemy developed an intricate system to account for the retrograde motion of the planets. In his scheme, each planet was attached to a small circle, called an epicycle, which moved it in a small orbit. The epicycle was attached in turn to a larger circle, or deferent, which moved around ...
friction Pluto
... future. One question that has been researched is how were planets and space objects formed? One thing is known, all objects need (1.) ____________________ to be held together. (2.)____________ is the process through which Earth and other planets were formed 4.5 billion years ago. During accretion, ( ...
... future. One question that has been researched is how were planets and space objects formed? One thing is known, all objects need (1.) ____________________ to be held together. (2.)____________ is the process through which Earth and other planets were formed 4.5 billion years ago. During accretion, ( ...
Solar Eclipses
... Eclipse Seasons If New Moon takes place within about 17° of a node, then a solar eclipse will be visible from some location on Earth. ...
... Eclipse Seasons If New Moon takes place within about 17° of a node, then a solar eclipse will be visible from some location on Earth. ...
Solar System Formation
... The colors on the map represent the type of rock that is at the surface.Different colors and patterns are used on geologic maps to show different types or ages of rocks. The geologic events in an area and the weathering and erosion that has taken place will determine what types and ages of rock are ...
... The colors on the map represent the type of rock that is at the surface.Different colors and patterns are used on geologic maps to show different types or ages of rocks. The geologic events in an area and the weathering and erosion that has taken place will determine what types and ages of rock are ...
Geocentric model
In astronomy, the geocentric model (also known as geocentrism, or the Ptolemaic system) is a description of the cosmos where Earth is at the orbital center of all celestial bodies. This model served as the predominant cosmological system in many ancient civilizations such as ancient Greece including the noteworthy systems of Aristotle (see Aristotelian physics) and Ptolemy. As such, they believed that the Sun, Moon, stars, and naked eye planets circled Earth.Two commonly made observations supported the idea that Earth was the center of the Universe. The stars, the sun, and planets appear to revolve around Earth each day, making Earth the center of that system. The stars were thought to be on a celestial sphere, with the earth at its center, that rotated each day, using a line through the north and south pole as an axis. The stars closest to the equator appeared to rise and fall the greatest distance, but each star circled back to its rising point each day. The second observation supporting the geocentric model was that the Earth does not seem to move from the perspective of an Earth-bound observer, and that it is solid, stable, and unmoving.Ancient Roman and medieval philosophers usually combined the geocentric model with a spherical Earth. It is not the same as the older flat Earth model implied in some mythology, as was the case with the biblical and postbiblical Latin cosmology. The ancient Jewish Babylonian uranography pictured a flat Earth with a dome-shaped rigid canopy named firmament placed over it. (רקיע- rāqîa').However, the ancient Greeks believed that the motions of the planets were circular and not elliptical, a view that was not challenged in Western culture until the 17th century through the synthesis of theories by Copernicus and Kepler.The astronomical predictions of Ptolemy's geocentric model were used to prepare astrological and astronomical charts for over 1500 years. The geocentric model held sway into the early modern age, but from the late 16th century onward was gradually superseded by the heliocentric model of Copernicus, Galileo and Kepler. There was much resistance to the transition between these two theories. Christian theologians were reluctant to reject a theory that agreed with Bible passages (e.g. ""Sun, stand you still upon Gibeon"", Joshua 10:12 – King James 2000 Bible). Others felt a new, unknown theory could not subvert an accepted consensus for geocentrism.