Transcript Do Nots
Today is Thursday, st April 21 , 2016 Pre-Class: Today we are reviewing. Have your questions ready! Today’s Agenda • • • • Review Review Birds? Review Review Game Rules • I will ask a question to the class. • Each participant (that’s you) writes down the answer silently. – Not each group…each individual. • After a few moments, I will say, “Compare answers.” • Each of you will look at what the other wrote. Review Game Rules • Did you each get the right answer? – 2 points. • Did one of you get the right answer? – 1 point. • Neither of you? – For shame. 0 points. – And eternal guilt. Review Game Rules • The List of Do Nots: – Do not talk to each other, make noises, gesture, give answers (my discretion here) between when the question has been read and when I say, “Compare answers.” • Doing so will result in a disqualification for that round. Don’t believe me? Try it. – Do not fall asleep when I’m getting scores. • If you’re not paying attention, I’m not giving you points. Review Question 1 • During any eclipse, the Moon, Earth, and Sun all align. What is the correct order of those celestial bodies during a total solar eclipse, starting with the Sun? – Sun Moon Earth. Review Question 2 • During any eclipse, the Moon, Earth, and Sun all align. What is the correct order of those celestial bodies during an annular solar eclipse, starting with the Sun? – Sun Moon Earth. Review Question 3 • What’s the difference between an annular solar eclipse and a total solar eclipse? – During an annular solar eclipse, the Moon’s primary shadow does not quite touch the Earth’s surface. The Sun shows an annulus (ring of fire) around the Moon. – During a total solar eclipse, the Moon’s primary shadow does touch the Earth’s surface and the Sun’s corona is visible around the Moon. Review Question 4 • The Moon’s main shadow during an eclipse is called what? What is the “secondary” shadow of the Moon called? MUST GET BOTH FOR CREDIT. – Primary shadow = Umbra. – Secondary shadow = Penumbra. Review Question 5 • Imagine three separate spacecraft. – Spaceship 1 flies 10 light years/hour. – Spaceship 2 flies 10 astronomical units/hour. – Spaceship 3 flies 10 parsecs/hour. • Which spaceship is flying fastest? – Spaceship 3. – One parsec equals 3.26 light years or 63,235.29 AU. Review Question 6 • BONUS NON-ASTRONOMY QUESTION • You may wager any/all of your points. • Category: Inventions • When electricity was in the early days of becoming commercialized, two men debated (feuded over) which type of current should be used, alternating current (AC) or direct current (DC). Who were these two men/sides in the War of the Currents? – Pro AC: Nikola Tesla – Pro DC: Thomas Edison Review Question 7 • The equivalent of longitude on the celestial sphere is known as…what? – Right ascension (RA or ). Review Question 8 • In what units is RA measured? – Hours/minutes/seconds (time). • NOT degrees (°). Review Question 9 • If neither the Northern Hemisphere nor the Southern Hemisphere is more directly angled toward the Sun, what type of day of the year is it? • (Hint: There are two of these days each year.) – The day is an equinox. Review Question 10 • What are the names of the two equinoxes? – Vernal (spring) equinox. – Autumnal (fall) equinox. Review Question 11 • What’s 3.45 x 10-3 in standard notation? • 0.00345 Review Question 12 • What’s (3 x 10-3) x (5 x 10-5) in scientific notation? • 1.5 x 10-7 Review Question 13 • What’s (3 x 10-3) + (5 x 10-5) in scientific notation? • 3.05 x 10-3 Review Question 14 • BONUS NON-ASTRONOMY QUESTION • You may wager any/all of your points. • Category: Birds • Which bird has the longest migration route (by distance) each year? – The Arctic Tern (12,000+ miles from the Arctic Circle to the Antarctic Circle). Review Question 15 • If you were looking down on the solar system from above the Sun, which way would Saturn be revolving? – Counterclockwise. All planets in the solar system rotate counterclockwise (as does the Sun). Review Question 16 • Fill in the blanks – you must get all of them for credit: • The Apollo 11 astronauts landed in one of the ___-colored regions of the moon, which is rich in lava-like rock. These regions are collectively called ___. – dark … maria Review Question 17 • How are the Moon and Sun oriented relative to Earth when there is a neap tide? – They are at right angles to one another, “canceling” each other’s gravity. Review Question 18 • What does synchronous rotation mean? – Like Earth’s Moon, the periods of rotation and revolution are equal. – In other words, the same side of the Moon always faces Earth. Review Question 19 • For the Moon, in days, how long does that period of synchronous rotation take? – 27.3 days. Review Question 20 • What do we call that period? Be specific. – A synodic month. Review Question 21 • How long does it take for a synodic day? – 24 hours. If you’re thinking 29.5 days, you’re thinking of a synodic month. Review Question 22 • BONUS NON-ASTRONOMY QUESTION • You may wager any/all of your points. • Category: Sports • From its founding until 1967, the NHL only had six teams. Which six cities did those teams call home? – New York (Rangers), Chicago (Blackhawks), Detroit (Red Wings), Boston (Bruins), Montreal (Canadiens), Toronto (Maple Leafs). Review Question 23 • Which star appears to move relatively very little in the Northern Hemisphere’s night sky? – Polaris, which is nearly at a +90° declination. Review Question 24 • Which side of the Moon is estimated to be older? – The far side of the Moon, since it has many more craters than the near side. Review Question 25 • The seasons are due in large part to the axial tilt of the Earth. Over many thousands of years, the Earth’s axis appears to “wobble” much like a top that is losing kinetic energy. What is the name for that axial wobble, due in large part to the gravity of the Moon? – Precession.