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File - Mr. Gray`s Class
File - Mr. Gray`s Class

... – Sun is very important to earth – without its heat and light, we would not be able to survive! – Gives us the Seasons – Its gravity keeps us, and the other planets, in orbit – It is the nearest star to us! We study it to learn about other stars. – It provides earth with A LOT of energy! – Changes i ...
document
document

... A) Jupiter is on the opposite side of the Sun B) of our position on the surface of the Earth. C) most of Jupiter's mass is gas and we cannot see gas. D) Jupiter is so far from Earth and Venus is much closer. 2) Stars appear as small points of light in the sky because A) they are so much dimmer than ...
Inside Orbit - July 2006 - Grand Rapids Amateur Astronomical
Inside Orbit - July 2006 - Grand Rapids Amateur Astronomical

05Sky1.ppt - NMSU Astronomy
05Sky1.ppt - NMSU Astronomy

... • Is it surprising that astrology doesn’t work? Are there successful scientific theories that make predictions about astrology? • Current theoretical understanding, which has been well supported by observation, says there are four basic forces in nature: – Gravity – Electromagnetic force – Strong fo ...
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Kepler

... II. Law of Equal Areas A line drawn from a planet to the Sun sweeps out equal areas in equal times. implication: orbital speeds are non-uniform yet vary in a regular way Closer a planet is the the Sun, the faster it moves in its orbit ...
Ch6-2014-P
Ch6-2014-P

... The Ptolemaic model of the universe has Earth at the center with the Moon, the planets, the Sun, and the stars revolving about it in complex superpositions of circular paths. This geocentric model, which can be made progressively more accurate by adding more circles, is purely descriptive, containin ...
Solar System: Planets Asteroids Comets
Solar System: Planets Asteroids Comets

... Mercury and construct a sphere of radius equal to the orbital radius of this planet. Construct an octahedron such that each of its faces touches the sphere. Next construct the sphere of Venus such that it touches each of the vertices of the octahedron. Continue with the planets and regular solids in ...
Feb 2016 - Sudbury Astronomy Club
Feb 2016 - Sudbury Astronomy Club

... Batygin and Brown published the result today in The Astronomical Journal. Alessandro Morbidelli, a planetary dynamicist at the Nice Observatory in France, performed the peer review for the paper. In a statement, he says Batygin and Brown made a “very solid argument” and that he is “quite convinced b ...
Twenty Seven Planeta..
Twenty Seven Planeta..

... children are afraid of the dark unless the number of hand-holding adults is at least one for two children. (Most first graders are not afraid of the dark if warned in advance.) If you have a kindergarten class that you would like to bring to the planetarium, please give me a call. Children at this a ...
The Celestial Sphere
The Celestial Sphere

... According to the Lakota, the Constellation of the Hand, namely the bottom half of the constellation Orion, represents the arm of a great Lakota chief. The gods wanted to punish the Lakota's chief for his selfishness and made the Thunder People rip out his arm. The chief's daughter offered to marry a ...
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Vampy Astronomy Syllabus

... Conduct family and friends on a tour of the night sky. Explain what is meant by the statement, “When we look at the night sky, we look into the past.” View the sun using safe procedures that protect your eyes from the harmful effects of solar light. Use Snell’s Law to determine the change of path fo ...
Handout 15: Virial Theorem E = P.E. + K.E = (1/2)P.E. = -K.E.
Handout 15: Virial Theorem E = P.E. + K.E = (1/2)P.E. = -K.E.

... For a star, gas is compressible, therefore density increases as r decreases Therefore more tightly bound than constant density Therefore PE is more negative than this ...
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gravitation_notes

... Law of Universal Gravitation allowed extremely accurate predictions of planetary orbits.  Cavendish measured gravitational forces between human-scale objects before 1800. His experiments were later simplified and improved by von Jolly. ...
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pluto and the dwarf planets quiz
pluto and the dwarf planets quiz

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geography chapter – 1 the earth in the solar system previous
geography chapter – 1 the earth in the solar system previous

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Planisphere Exercise
Planisphere Exercise

... the 8 p.m. CDT time to represent the sky at 9 p.m. CDT. Make this adjustment only when daylight savings time is observed locally. Which famous asterism is located high in the south at chart time? ...
Can we prove God Exists? Part 1 How can modern science help us
Can we prove God Exists? Part 1 How can modern science help us

... During the last decade cosmology/astronomy has become increasingly friendly to the Creator model. Discoveries about the origin of the Big Bang as well as the requirements for life on a planet like earth reveal more and more the hand of a Creator and make it less and less likely this could all have h ...
Saturn lecture
Saturn lecture

... Pressure and temperature conditions were such that methane, ammonia and water were stable in solid form As you move out from the sun, each planet has less hydrogen and helium and more ice ...
Ay123 Fall 2011 STELLAR STRUCTURE AND EVOLUTION Problem Set 3
Ay123 Fall 2011 STELLAR STRUCTURE AND EVOLUTION Problem Set 3

... the flux (which is the integral of I(µ, τ = 0), over the surface). Recall that we derived an approximate solution for T (τ ) for a plane parallel atmosphere, which should be used for this problem. We also derived in class an appropriate mean optical depth to evaluate I(µ, τ = 0). Assume the source f ...
Narrat - ESA/Hubble
Narrat - ESA/Hubble

... Hubble cannot observe our Sun, or the closest planet, Mercury, because its instruments are light-sensitive and would be damaged. However, the telescope has examined every other planet in the solar system, including dwarf planets Pluto, Ceres and Eris. But, of course, Hubble does not just produce pre ...
Great Basin - 2016 NSS Convention
Great Basin - 2016 NSS Convention

... night sky. Many future astronomers have been hooked upon their first view of this planet. Saturn is the sixth planet from the Sun and the second largest planet in the Solar System. Saturn has a prominent system of rings, ...
Lecture 39: Life in the Universe The Main Point Simple Life vs
Lecture 39: Life in the Universe The Main Point Simple Life vs

... N = Number of civilizations in the Galaxy capable of communicating with us R* = The rate of star formation in the Galaxy (stars/year) fs = fraction of stars that are Sun-like Np = number of planets per star fe = fraction of "environmentally correct" planets fL = fraction of planets where life develo ...
Time, Day, Month, and the Moon
Time, Day, Month, and the Moon

... The Moon is ~1/4 of the Earth in diameter and ~1 percent in mass. The rotation of the Moon and its revolution around the Earth takes 27 days, 7 hours, and 43 minutes. This is the Sidereal Period of the Moon s orbit. The period of time it takes the moon to go through its cycle of phases is called its ...
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Dynamical properties of the Solar System Dynamics of planetary

... •  In this limit, two objects can be considered to be isolated in space and to move around each other according to Keplerian laws –  Kepler’s laws are easily shown to be the result of the inverse-square law of gravity, with the Sun as the central body, and the conservation of angular momentum and en ...
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Orrery



An orrery is a mechanical model of the solar system that illustrates or predicts the relative positions and motions of the planets and moons, usually according to the heliocentric model. It may also represent the relative sizes of these bodies; but since accurate scaling is often not practical due to the actual large ratio differences, a subdued approximation may be used instead. Though the Greeks had working planetaria, the first orrery that was a planetarium of the modern era was produced in 1704, and one was presented to Charles Boyle, 4th Earl of Orrery — whence came the name. They are typically driven by a clockwork mechanism with a globe representing the Sun at the centre, and with a planet at the end of each of the arms.
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