Astronomy and Cosmologyweek 2 - Tuesday

• Star Date• Short lecture on Ch.1-2• Questions?• Your Web-X posts• Thursday assignments• Solar motion workshop: predictions +

assemble tools• Break• Celestial Navigation

Review from week 1Scientific notation

Distance measurements: ly ~ 1016 m

Angle measurements: moon ~ ½ degree = 30’

Scales

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

Questions? Post to WebX

Thursday assignments & Library workshops

Moon workshop Thursday

• Do predictions before class

• Print out fresh copy of whole workshop

Sun workshop with Cel Nav

• Hand in predictions

• Start assembling tools

Celestial Navigation

• Discuss Space/time workshop from last week

• Key points

• Measuring space and time: angles and hours

• Questions?

• Solar motion workshop this week and next

• Hand in predictions (with your name)

• Assemble Solar Motion Demonstrators

• Answer workshop questions with new tools