![]() 93) vernal equinox The celestial analogues of longitude and latitude are _ and _, respectively. Shorter When the Sun reaches the point in the sky known as the _, it is the first day of spring in the northern hemisphere. Hint: enter a number in the first blank and enter either longer or shorter in the second blank. Therefore, a sidereal day is _ minutes _ than a solar day. On the horizon A given star near the celestial equator rises about _ minutes earlier each night because of Earth's revolution around the Sun Answer choices: / Polaris / Vega / Thuban / Deneb Polaris As viewed from Earth's equator, the North Star appears to be located (due North / due East / due South / due West ) and (at the zenith / at the nadir / on the horizon ). 92) Answer choices: / one-fourth as large / one-half as large / the same size (no effect) / twice as large / four times as large twice as large The star _ is called the North Star because it is a bright star close to the North Celestial Pole. Lunar If the Moon were placed at twice its current distance from the Earth, how large (physically) would it have to be so that total solar eclipses could still occur? (Textbook, 4th edition, question 3, p. Lined up as follows: Sun - Earth - Moon Solar When this happens, the shadow of the Moon covers a small portion of the Earth When this happens, the Moon is covered by the Earth's shadow Lunar eclipse or solar eclipse.Ĭan be seen from the entire night-side of the Earth (weather permitting)Ĭan be seen from a small portion of the day-side of the Earth more Matching 3: Facts about Eclipses: For each fact on the left, write the name of the correct eclipse on the right. Use scientific notation to make it 6.3 x 10^2 If you look toward the horizon, the stars you see will likely be twinkling ( more / less ) than the stars overhead? more The planet Saturn, which is farther away and physically smaller than Jupiter, is likely to twinkle ( more / less ) than Jupiter. ![]() ![]() 93) Your answer should be a whole number with 2 significant figures you may enter your answer in decimal format or scientific notation (x.xex). A magnitude 3 star is _ times brighter than a magnitude 10 star. 92.)Ī 16th magnitude star is ( brighter / dimmer ) than an 11th magnitude star by a factor ofĪ 16th magnitude star is ( brighter / dimmer ) than a 6th magnitude star by a factor of (a) Compare a 16th-magnitude star with an 11th magnitude star in brightness which is brighter and by how many times? (b) Now compare a 16th-magnitude star with the 6th magnitude star, specifying which is brighter and by how many times. (d) The tilt of Earth's axis of rotation causes the Sun to pass higher in the sky during the day in one hemisphere than in the other, thereby giving more daylight hours and more heating per hour. (e) It has seasons so that sunbathers will know when to go to the beach, and skiers will know when to go skiing. (c) Over the course of the year, the tilt of Earth's axis varies from 23.5° to 0° in such a way as to bring more heating per hour in the summer than in the winter. Because it is closer to the Sun, it receives more solar energy per hour. (b) The tilt of Earth's axis of rotation causes one hemisphere of the planet to be substantially closer to the Sun during the day than the other hemisphere. We have summer when we are closer to the Sun and winter when we are farther from the Sun. True Which one of the following is the main reason why the Earth has seasons? (a) Earth's orbit is elliptical. ![]() False True or False? More "circumpolar stars" (i.e., stars that are always above the horizon) are visible from Alaska than from Hawaii. ![]() True True or False? Venus and Mercury are sometimes visible at a position in the celestial sphere diametrically opposite the Sun. eclipticĬelestial equator True or False? As observed from Earth, Jupiter sometimes appears to be in the crescent phase False we only see crescents for Mercury, Venus and the moon True or False? If the Earth's axis of rotation were perpendicular to Earth's orbital plane (i.e., if Earth's axis weren't tilted), there would be no major seasonal variations at a given location on Earth throughout the year. True The equinoxes are the two points where the ( ecliptic / meridian / plane of the Moon's orbit ) crosses the ( galactic plane / zenith/nadir / celestial equator ). True or False? The Sun rises due East and sets due West everywhere on Earth on both equinoxes. ![]()
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