1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) ASSIGNMENT #2 Due Feb 18 at 11:59pm Points 20 Questions 20 Available Jan 23 at 12am - Feb 18 at 11:59pm Time Limit None Allowed Attempts 3 Instructions Read eBook Chapter 2. ASSIGNMENTS are UNTIMED and allow for RESUBMISSION of incorrect answers. You may leave an assignment and return at a later time. Answer each question, then click the "Check" button below it. This will tell you if your answer is correct. If your answer is incorrect, you may check another answer for partial credit. (A penalty applies for each wrong answer.) However, DO NOT SIMPLY RANDOMLY GUESS at a new answer. Instead, REVIEW the material and post questions on the FORUM if needed. When you have completed all questions, click the "SUBMIT ALL AND FINISH" on the grade summary page of the assignment. (NOTE: Once this button is clicked you cannot return to the assignment.) Take the Quiz Again Attempt History https://canvas.csun.edu/courses/128915/quizzes/441254 1/12 1/27/23, 10:48 AM LATEST ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Attempt Time Score Attempt 1 25 minutes 19 out of 20 Score for this attempt: 19 out of 20 Submitted Jan 27 at 10:47am This attempt took 25 minutes. Question 1 1 / 1 pts What is the name of the brightest star in the night sky? Correct! orrect Answers Sirius Sirius Polaris Question 2 1 / 1 pts The _________ _________ is the dividing the celestial sphere into northern and southern hemispheres. (two words) Correct! orrect Answers celestial equator celestial equator Question 3 1 / 1 pts Constellations that do not set and are always above our horizon are called ___________ constellations. https://canvas.csun.edu/courses/128915/quizzes/441254 2/12 1/27/23, 10:48 AM Correct! orrect Answers ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) circumpolar circumpolar Question 4 1 / 1 pts The point on the celestial sphere directly above the north pole of the earth is called the _________. (3 words) Correct! orrect Answers north celestial pole north celestial pole Question 5 1 / 1 pts The point in the sky directly overhead of any observer is called the _________. Correct! orrect Answers zenith zenith Question 6 1 / 1 pts What is the celestial sphere? https://canvas.csun.edu/courses/128915/quizzes/441254 3/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) The celestial sphere represents a belief in an Earth-centered universe, and hence is no longer considered to have any use. The celestial sphere is a model that shows the true locations in space of the Sun and a few thousand of the nearest stars. Correct! The celestial sphere is a representation of how the entire sky looks as seen from Earth. The celestial sphere is a model of how the stars are arranged in the sky relative to our Sun, which is in the middle of the sphere. The celestial sphere is another name for the Sun. Below is a diagram of the Celestial Sphere. At the center of the diagram is the Earth with the top being the North Pole. The Sun's apparent path is marked in yellow with an arrow indicating the direction the Sun moves along the celestial sphere. https://canvas.csun.edu/courses/128915/quizzes/441254 4/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Question 7 1 / 1 pts The line marked D in the celstial sphere diagram represents the ___________________. ecliptic Correct! celestial equator zenith horizon south celestial pole nadir north celstial pole https://canvas.csun.edu/courses/128915/quizzes/441254 5/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Question 8 1 / 1 pts The line marked C in the celstial sphere diagram represents the ________________. nadir horizon south celestial pole zenith celestial equator Correct! ecliptic north celstial pole Question 9 1 / 1 pts The point marked A in the celstial sphere diagram represents the ________________. ecliptic south celestial pole zenith Correct! north celstial pole horizon nadir https://canvas.csun.edu/courses/128915/quizzes/441254 6/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) celestial equator 1 / 1 pts Question 10 The angle between lines C and D in the diagram depends on the tilt of the Earth's axi and is 23.5 degrees. Answer 1: Correct! tilt of the Earth's axis Answer 2: Correct! 23.5 Question 11 1 / 1 pts You live at a latitude of 730 N. What is the angle between the northern horizon and the north celestial pole? 27 degrees Correct! 73 degrees 17 degrees 23.5 degrees 90 degrees https://canvas.csun.edu/courses/128915/quizzes/441254 7/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Question 12 0 / 1 pts Suppose an astrophotographer hands you a picture with star trails taken looking toward the north celestial pole. If the star trails are 1/5 of a complete circle, about how many hours was the picture exposed? ou Answered orrect Answer 4.8 5 margin of error +/- 0.05 Question 13 1 / 1 pts The apparent path of the Sun through the constellations as viewed from Earth is called the ______________. Correct! orrect Answers ecliptic ecliptic Question 14 1 / 1 pts Based on this figure, in what constellation does the Sun appear on July 1? https://canvas.csun.edu/courses/128915/quizzes/441254 8/12 1/27/23, 10:48 AM Correct! orrect Answers ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Gemini gemini 1 / 1 pts Question 15 Match the description of the Sun's position with the name of the special point on the Sun's path. Correct! The sun is crossing the celestial equator moving vernal equinox north. Correct! The sun is crossing the celestial equator moving autumnal equinox south. Correct! The sun farthest north. summer solstice Correct! The sun farthest south. winter solstice Other Incorrect Match Options: vernal solstice Question 16 1 / 1 pts On which of the following days will the Sun appear on the celestial equator. Correct! autumal equinox https://canvas.csun.edu/courses/128915/quizzes/441254 9/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Yes. Equinoxes are defined as the days when the sun crosses the celestial equator. the summer solstice winter solstice Question 17 1 / 1 pts The gradual wobble that changes the orientation of earth's axis in space is called ____________. Correct! orrect Answers precession precession Question 18 1 / 1 pts Are we ever able to view the Sun at our zenith in Los Angeles? Yes, on the equinoxes. Yes, on the summer solstice. Yes, every day at about noon. No, the north celestial pole is always at our zenith. Yes, on the winter solstice. Correct! No, we are too far north. https://canvas.csun.edu/courses/128915/quizzes/441254 10/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) Question 19 1 / 1 pts Which of the following best describes why we have seasons on Earth? Earth's elliptical orbit means we are closer to the Sun and therefore receive more intense sunlight at some times of year than at others. The tilt of Earth's axis causes the northern hemisphere to be closer to the Sun than the southern hemisphere in summer, and visa versa in winter. The Sun's total energy output varies throughout the year and is greatest during the summer and least during the winter. Correct! The tilt of Earth's axis causes different portions of the Earth to receive more or less direct sunlight at different times of year. The varying speed of Earth in its orbit around the Sun gives us summer when we are moving fastest and winter when we are moving slowest. Question 20 1 / 1 pts The maximum tilt of the northern hemisphere toward the sun occurs ________. in the middle of summer on the last day of summer Correct! on the first day of summer https://canvas.csun.edu/courses/128915/quizzes/441254 11/12 1/27/23, 10:48 AM ASSIGNMENT #2: ASTR 152 ELEM ASTRONOMY - (18008-SP2023) in the middle of winter Quiz Score: 19 out of 20 https://canvas.csun.edu/courses/128915/quizzes/441254 12/12
