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Flashcards do conjunto (39)
- 1In the system of celestial coordinates that matches latitude and longitude on the Earth, which is the coordinate that is equivalent to longitude?right ascension
- 2Two celestial coordinates that together describe a star's position precisely in our sky areright ascension and declination
- 3In the system of celestial coordinates that matches latitude and longitude upon the Earth, which is the coordinate that is equivalent to latitudedeclination
- 4The nightly motion of objects across our sky from horizon to horizon is caused by therotation of the Earth on its axis
- 5The constellationsare 88
- 6The ecliptic can be defined as thepath traced out by the Sun in our sky over one year against the background stars
- 7If the Earth's spin axis were perpendicular to the plane of its orbit (the ecliptic), seasonal variations on the Earth wouldhave the same severity, but each season would last twice as long
- 8Where on Earth would you have to stand for the Sun to pass directly overhead (i.e., pass through your zenith) at some time during the year?in the tropics, or within +/– 23.5° of the equator
- 9How often does the Sun cross the celestial equator in a given year?twice
- 10The angle between an observer's horizon and the north celestial pole is governed bylatitude
- 11Polaris, the “pole star,” is at presentwithin 1° of the north celestial pole.
- 12Approximately when does a full Moon rise?sunset
- 13Which of the following planetary configurations is impossible for an inferior planet?opposition
- 14The Sun exerts a gravitational pull on Earth. Why doesn't Earth fall into the Sun?Earth is moving across the Earth-Sun direction, so Earth is pulled around in a circle.
- 15The total number of eclipses is limited to seven or fewer per year because one condition that must be met for a lunar or solar eclipse is that theMoon be close to or crossing the ecliptic plane.
- 16Which of the following planetary configurations or positions is impossible for one of the outer planetsinferior conjunction
- 17The planets that were known before the telescope was invented wereSaturn, Venus, Mars, Mercury, and Jupiter.
- 18Ptolemy's model for the solar system wasEarth-centered, with planetary orbits composed of deferents and epicycles.
- 19When the Sun is at one of the equinoxes?day and night are of equal length everywhere on the Earth
- 20If observed carefully night by night, a particular star will be seen to riseabout 4 minutes earlier every night
- 21Why do we see different phases of the MoonThe illuminated half of the Moon becomes more or less visible from Earth as the Moon orbits the Earth.
- 22If the Moon is between the Sun and the Earth and almost in line with the Sun, we call its phasenew Moon
- 23A solar eclipse occurs on the Earth when theMoon casts a shadow on the Earth.
- 24If the plane of the Moon's orbit were the same as the ecliptic plane, there would be a lunar eclipseonce per month.
- 25A lunar eclipse is caused by theMoon passing into the shadow of the Earth.
- 26It is unsafe to view which type of eclipse without special eye protection?solar eclipse
- 27In following the principles of the scientific method, a theory proposed to explain a given phenomenon mustexplain all known and reliable observations and predict new experiments and observations
- 28In the ancient Greek era, it was almost universally believed that theEarth was at the center of the universe
- 29An apparent westward motion of a planet from night to night compared to the background stars (as viewed from the Earth) is referred to asretrograde motion
- 30Retrograde motion of a planet when viewed from the Earth is caused by the fact that theEarth is moving.
- 31The Copernican system for planetary motions isSun-centered, with the planets moving in perfect circles around the Sun
- 32The sidereal period of a planet is defined as the time between two successivepassages of the planet in front of a particular point in the sky (e.g., a star) as seen from the Sun.
- 33The greatest inaccuracy in Copernicus' theory of the solar system wasplacement of the planets in circular orbits
- 34The reason Copernicus' heliocentric theory soon came to be regarded as preferable to the geocentric theory of Ptolemy is that the heliocentric theory accounted forthe same observed motions of the planets as the geocentric theory but did so in a much simpler way.
- 35Retrograde motion was important in the development of our understanding of the solar system becauseits description in terms of the heliocentric model is a great simplification in comparison to its description in terms of the geocentric model.
- 36Which of the following bodies does not exhibit retrograde motion when observed from Earth?Moon
- 37A significant contribution of Kepler to our understanding of the solar system was thediscovery that planetary orbits are not circular.
- 38The phenomenon of parallax is thechange in apparent position of a nearby object compared to background objects as a result of the motion of the observer.
- 39The major contribution of Tycho Brahe to the development of modern astronomy wasmeasuring planetary positions very accurately
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- FlashCards sobre Sem título, criado por monti1994 em 11-12-2013.
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