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The Night Sky…last time, The Horizon System

Explore the mesmerizing dance of the Sun, Moon, and stars as they traverse the celestial stage, showcasing the beauty of seasonal variations. Delve into the astronomical basis of astrology and the concept of celestial coordinates in this fascinating journey through the night sky.

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The Night Sky…last time, The Horizon System

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  1. The Night Sky…last time, The Horizon System • The Sun rises in the east, transits, sets in the west. • The Moon…. • The stars …. • The moon changes position against the stars from night to night • The sky changes with the seasons (“parade of the constellations”) ?

  2. “Different Seasons, Different Constellations” • The Earth orbits the Sun • We see the Sun projected against background stars • Earth moves in a plane, Sun projected onto a line on the sky

  3. The Moon and the major planets also move along the celestial line (ecliptic or zodiac) • This demonstrates and important fact: major solar system bodies are orbiting the Sun in the same plane • Astronomical basis for the origin of astrology

  4. Seasonal Variations in the Position of the Sun (back in horizon system)

  5. Explanation of Seasonal Variations: tilt of the Earth’s axis: obliquity of the ecliptic

  6. Obliquity of the Ecliptic and the Altitude Angle of the Sun

  7. Two Lines on the Sky • The ecliptic • The celestial equator • See Figure 2.4

  8. Conclusion: seasons are due to tilt of Earth’s axis and motion of Earth about the Sun Not changing distance between the Earth and Sun

  9. A New Coordinate System: Celestial Coordinates • The stars “stick together” and define their own reference system. The planets move with respect to them • Celestial coordinates are Right Ascension and Declination • Right Ascension ….. Longitude • Declination ….latitude • http://sohowww.nascom.nasa.gov/ See SC1 chart for illustration

  10. Map of the Sky

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