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1 Precession of the equinoxes 1 of 3 7/27/ :14 PM Name: Partner(s): Day/Time: Version: plan Precession - Planetarium Activity This document is adopted from Michigan Astronomy and edited to make it applicable for Tarleton State University, Stephenville TX, Astronomy course under Creative Common License ( Part 1: The Sky Now Your GSI will show the sky at noon on May 1 of this year. She or he will also point out the Sun's position at the June Solstice. 1. In which constellation is the Sun? 2. In which constellation is the Sun at the June solstice? 3. The GSI will let the day and night proceeds. Watch for the position of the North Celestial Pole. In which constellation is the pole? Enter the Declination of the pole in Table Find the constellations in Table 1 and enter their approximate Declinations and Altitudes in Table 1. If the constellation is below the horizon, enter "Below Horizon" for the Altitude. Part 2: The Sky in the Year 11,000 BC Your GSI will show the sky at noon on May 1, 11,000 BC (13,000 years ago). She or he will also point out the Sun's position at the June Solstice. 5. In which constellation is the Sun? 6. In which constellation is the Sun at the June solstice? 7. The GSI will let the day and night proceed. Watch for the position of the North Celestial Pole. In which constellation is the pole? Enter the Declination of the pole in Table Find the constellations in Table 1 and enter their approximate Declinations and Altitudes in Table 1. If the constellation is below the horizon, enter "Below Horizon" for the Altitude.
2 Precession of the equinoxes 2 of 3 7/27/ :14 PM Table 1: Object declination and altitude Now 11,000 BC North Celestial Pole Ursa Minor Declination Altitude Declination Altitude Corvus Crux Concluding Questions 1. List the constellations that immediately circle the North Celestial Pole today: List the constellations that immediately circled the North Celestial Pole in 11,000 BC, using your answer to Question 7: Recall that circumpolar constellations are defined to be those that do not set below the horizon. Have the circumpolar constellations changed since 11,000 BC? Explain. Figure 4 in the Introduction may be helpful. 2. Did the coordinates of stars change between 11,000 BC and the present, in the equatorial coordinate system? Explain.
3 Precession of the equinoxes 3 of 3 7/27/ :14 PM 3. In the year AD 15,000, will the constellation Crux be visible from Ann Arbor? Explain. 4. In the year AD 15,000, will the Sun's path in the sky still follow the same zodiac constellations? Explain. 5. We say that Taurus is a winter constellation because it is in the evening sky in our (northern) winter. Based on your answers to Questions 1-2 and 5-6 in Parts 1 and 2 above, which zodiac constellation was in the winter evening sky in the year 11,000 BC? Figure 1 in the Introduction may be helpful.
4 1 of 6 7/27/ :15 PM Images of the stars along the ecliptic as they appear in the planetarium with and without lines NOTE: Images have been sized to fit on the printed page and are not necessarily to scale with each other (i.e. large constellations may have been shrunk more than small constellations) Aries Taurus
5 2 of 6 7/27/ :15 PM Gemini Cancer
6 3 of 6 7/27/ :15 PM Leo Virgo
7 4 of 6 7/27/ :15 PM Libra Scorpio
8 5 of 6 7/27/ :15 PM Sagittarius Capricorn
9 6 of 6 7/27/ :15 PM Aquarius Pisces
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