Astronomy and Cosmologyweek 1 - Thursday

• Star Date

• Your surveys – results and discussion

• Your Web-X posts

• Your minilecture sign-ups… BREAK

• Introduction to space and time

• Workshop: Planispheres + Starry Night• Workshop: Space and Time (go outside if clear)

• Tomorrow and next week

Introduction to Space and Time

Naked eye astronomy ConstellationsTime: Sky changes (Starry Night)• Through the day, due to Earth’s rotation• Through the year, due to Earth’s orbit• Through the seasons, due to Earth’s tilt• Through the epochs, due to precessionSpace• celestial sphere• Equinoxes, solstices

Naked eye astronomy

What you see depends on where you are, in space, time and culture.

Constellations help orient us

Time: Sky changes (Starry Night)

• Through the day, due to Earth’s rotation

• Through the year, due to Earth’s orbit

• Through the seasons, due to Earth’s tilt

• Through the epochs, due to precession

Sky changes through the day, due to Earth’s rotation

Sky changes through the year, due to Earth’s orbit

Sky changes through the seasons, due to Earth’s tilt

Sky changes through the epochs, due to precession

Celestial sphere

Altitude from horizon Declination from equator (latitude)

Azimuth from North RA from VE (longitude)

Equinoxes and solstices