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Lab 02

Astronomy 105 Laboratory. Lab 02. Clicker Registration. Lab 02 Quiz. How many significant figures? 2200.01 . one two three four five six seven. 30. Countdown. 36.01 × 1.5 × 4.44 × 43 = ? How many significant figures in the answer? . one two three four five six seven. 30.

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Lab 02

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  1. Astronomy 105 Laboratory Lab 02

  2. Clicker Registration

  3. Lab 02 Quiz

  4. How many significant figures? 2200.01 • one • two • three • four • five • six • seven 30 Countdown

  5. 36.01 × 1.5 × 4.44 × 43 = ?How many significant figures in the answer? • one • two • three • four • five • six • seven 30 Countdown

  6. Problem: (4.0 × 102) (3.0 × 104) Answer in Standard Scientific Notation • 12 X 108 • 12 X 106 • 1.2 X 106 • 1.2 X 107 • 7.0 X 106 • 7.0 X 107 30 Countdown

  7. In today’s lab we will learn to find our way around the sky using • the Flamsteed Catalogue. • a telescope. • a star chart. • the Greek Alphabet. 30 Countdown

  8. The ______ is the apparent path of the sun through the sky. • ecliptic • meridian • celestial equator • zenith 30 Countdown

  9. Lab 02 Constellations – Sky Familiarization

  10. The Celestial Sphere 32o Equal to your latitude 32o Meridian Zenith As seen from Nacogdoches CE NCP West North South Horizon East SCP

  11. Sky Familiarization • Stars and Constellations Visible • Depends on: • Time of Day – Earth’s Rotation • Calendar Date – Earth’s revolution about the sun

  12. Sky Familiarization • Objectives: Using the SC-1 star chart, for a given date and time • Locate the meridian, zenith, and the due east and west points on the horizon • Identify stars and constellations visible

  13. Summer Solstice Ecliptic Sun’s Path Vernal (spring) Equinox Celestial Equator Autumnal (fall) Equinox North East South

  14. Vernal (spring) Equinox Autumnor (fall) Equinox Winter Solstice North West East South

  15. Deep Sky Objects Bright Stars Fainter Stars Constellation Summer Solstice EclipticSun’s Path Star Names Vernal Equinox Greek Letters Celestial Equator Autumnal Equinox Declination (degrees) Right Ascension (hours) North East South Celestial Prime Meridian

  16. North Find the position of the star Sirius East RA = 6h 45m DEC = -17° Celestial Prime Meridian South

  17. Zenith 32°(your latitude) Due West on Horizon North April 21 @ 8:00 p.m. East South Meridian

  18. April 21 @ 8:00 p.m. Due East Point Horizon

  19. April 21 @ 8:00 p.m. zenith Approximate part of the sky not visible at 8:00 p.m. West East East West Meridian

  20. Zenith Due West on Horizon April 21 @ 8:00 p.m. North East South Meridian

  21. Zenith Due West on Horizon April 21 @ 9:00 p.m. North East South Meridian

  22. Zenith Due West on Horizon April 21 @ 10:00 p.m. North East South Meridian

  23. January 5 @ 8 pm January 10 @ 8 pm January 10 @ 8:00 p.m. North East Stars cross the meridian 4 min. earlier each day due to the Earth’s revolution. 5 days X 4 min/day = 20 min

  24. Sky Familiarization • A Few Things to Remember • Any vertical line on your SC-1 (north-south) is a meridian. • Approximately one half of the stars on the SC-1 are visible at any given time (12 hours of RA). • The Earth’s Rotation • Stars, the sun, moon, and planets rise and set each day • The Earth’s Revolution about the Sun • Seasonal Stars and Constellations

  25. Lab Exercise • Classroom • Using the SC-1 Star Chart for March 22@ 8 pm • Complete the “Classroom Activity” on page 13 (Use a ruler! Lines should be neat and accurately placed. Print your name on the star chart.) • Planetarium • Planetarium demonstration with the sky set for today's date. • The TA will reset the sky to the date specified in the “Classroom” activities above • Complete the Planetarium Activity on page 14.

  26. End

  27. The Celestial Sphere As seen from Nacogdoches CE NCP West North South Horizon East SCP

  28. The Earth’s Rotation: Daily Motion Noon Sunrise The Earth rotates towards the east (CCW) The Earth’s Rotation stars move 15°/hour from east to west Sunset Midnight

  29. Spring Stars Summer Stars Winter Stars Fall Stars The Earth’s Revolution: Annual Motion • The Earth’s Revolution • seasonal stars and constellations

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