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Lecture 5 – The Night Sky. What is the connection between what’s in the book and what’s in the sky?. We will discuss many types of objects; let’s see them too. Examples: Red Supergiants (Antares) “Population II Stars” (Arcturus) Galaxies (M81)

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lecture 5 the night sky

Lecture 5 – The Night Sky

What is the connection between what’s in the book and what’s in the sky?

we will discuss many types of objects let s see them too
We will discuss many types of objects; let’s see them too
  • Examples:
  • Red Supergiants (Antares)
  • “Population II Stars” (Arcturus)
  • Galaxies (M81)
  • Basic astronomical phenomena known since antiquity
  • First, we need a system to describe the sky
first reference system the horizon system

First reference system: the Horizon System

Two coordinates: altitude and azimuth

in horizon system we see motions in the sky
In Horizon System, we see motions in the sky
  • The Sun rises in the east, reaches highest altitude angle due south, sets in the west
  • When the Sun sets, it gets dark and we see the stars and planets
  • The Moon “ “ “ “ “
  • The Moon rises at a different time each night and is seen against a different constellation
  • The constellations in the evening sky are different in different seasons
question for the audience

Question for the audience:

What is going on to cause this east-to-west motion of all objects, rising in east and setting in west?

seasonal differences in the night sky go out tonight at 10pm
Seasonal differences in the night sky: go out tonight at 10PM
  • Constellations Bootes almost overhead
  • Constellation Leo in the west
  • Bright star Vega low in the east
  • Constellation of Virgo in the south
  • Constellation of Scorpius (with bright star Antares) low in southeast.
  • Check it out with the help of the SC1 chart!
go out again at 10pm in mid september
Go out again at 10PM in mid-September
  • Scorpius (and Antares) will be due south, to south-west
  • The constellation Aquila (bright star Altair) will be in southeast
  • Bright star Vega straight overhead
  • Arcturus and Bootes way over in the west
  • Come back in February, more changes still
question what causes this phenomenon of the parade of the constellations
Question: What causes this phenomenon of the “Parade of the Constellations”?

Demonstration, more next time

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