lecture 3

What does Right Ascension measure?

• A star's position west to east relative to the spring equinox

• A star's position south to north relative to the celestial equator

• A star's position east to west relative to the summer solstice

• A star's position north to south relative to the celestial equator

What does Declination measure?

• A star's position west to east relative to the spring equinox

• A star's position south to north relative to the celestial equator

• A star's position east to west relative to the summer solstice

• A star's position north to south relative to the celestial equator

Why do stars appear to rise and set?

• Because Earth rotates from east to west

• Because Earth rotates from west to east

• Because stars move from east to west

• Because stars move from west to east

What is the relationship between the altitude of the celestial pole and latitude?

• They are equal

• The altitude of the celestial pole is always higher than latitude

• The altitude of the celestial pole is always lower than latitude

• There is no relationship between them

What determines a star's path in the local sky?

• Latitude and the star's declination

• Longitude and the star's right ascension

• Latitude and the star's right ascension

• Longitude and the star's declination

What happens to stars at the North Pole?

• Stars remain at the same altitude as Earth rotates

• Stars rise and set like at any other latitude

• Stars are always below the horizon

• Stars are always above the horizon

What happens to stars at the equator?

• All stars remain above the horizon for exactly 12 hours each day

• Stars rise and set like at any other latitude

• Stars are always below the horizon

• Stars are always above the horizon

What happens to stars in the northern hemisphere?

• Stars with declination greater than (90° - your latitude) are circumpolar

• Stars with declination less than (90° - your latitude) are circumpolar

• Stars with right ascension greater than (90° - your latitude) are circumpolar

• Stars with right ascension less than (90° - your latitude) are circumpolar

What is the angular measurement for a full circle?

• 180°

• 270°

• 360°

• 450°

What is the angular measurement for 1 minute?

• 30°

• 45°

• 60°

• 90°