Lecture 5 the night sky
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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

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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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