Astronomy midterm 1 study guide

The motion of the star can then be detected by astronomers on Earth via the doppler effect of light. We also know that it must be a waxing crescent Moon, because the wanning crescent Moon sets before sunset.

The view of the Moon in the first scene thus indicates that we are looking West and the Moon is about to set. The Moon's position in both scenes is illustrated below. Defined as center to focus distance divided by length of semimajor axis. Because the star is much more massive than a planet this force causes only a very small acceleration toward the planet.

Earth's orbit is elliptical, we have summer when we are closer to the Sun and Winter when we are farther from the Sun. Copernican revolution Proposed the sun is the center of the earth Ecliptic The apparent path the sun traces out in the sky during the year Tycho Brahe Compiled most accurate naked eye measurements ever of planetary positions.

Gets "fuller" and rises later each day. The images made by the telescopes in interferometry mode will have the effective resolution of a telescope the size of their spacing.

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The Earth changes its axial tilt angle relative to the Ecliptic plane during each orbit in such a way as to bring more light in the summer. Sidereal Day 24 hours vs.

K12 astronomy midterm exam

Because it is closer to the Sun, it receives much more solar energy. The view of the Moon in the first scene thus indicates that we are looking West and the Moon is about to set. Some claimed that a Sun-centered Universe went against Biblical scripture and therefore could not be true. As the star moves toward us its light waves get bunched up in front of it making the wavelength shorter blueshifted , likewise as the star moves away from us the light waves get spread out to longer wavelengths redshifted. The tilt of Earth's axis causes one hemisphere to receive more direct sunlight than the other, for a longer period of time, increasing the energy deposited there. A few scenes later we are back to the same viewpoint but now it is late at night and again the Moon is visible. Photons can ionize atoms. To ionize an atom requires the input of energy. Thus, as the planet orbits the star it tugs and pulls the star toward and away from our line of site. They also pointed out that if the Earth were moving about the Sun once per year and spinning once per day it would mean that the Earth would be moving very fast, and yet we do not feel this motion, nor did they measure any correolis effect in the motion of objects on Earth's surface. Galileo observed that Jupiter had moons that orbited it rather than Earth, proving that not everything in the Heavens revolved around Earth. The Moon only rises in the East, and crescent Moons only rise somtime near sunrise. Ptolemaic model Most sophisticated geocentric model. During an eclipse of the Moon by the Earth only a small spot on the Moon is covered by Earth's shadow. Discovered planets orbit on ellipses.

Galileo also observed the planet Venus to go through a full cycle of phases, just like the Moon. Newton's 2nd law An object experiencing a force will accelerate in the direction of that force.

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Astronomy Midterm Study Guide