Seasons and Coordinates pt. 1

What are the units for Right Ascension?

• 
  Degrees, arc-minutes, arc-seconds

• hours, minutes, seconds

• millimeters, centimeters, meters

• kilometers, astronomical units, light years

• right, left, up, down

What day is the Sun located at 0° DEC and 0 Hr RA?

• December 21

• June 21

• March 21

• September 21

What is the range of the Sun's declination in the sky throughout a year?

• 0 degrees

• -23.5 to +23.5 degrees

• 23.5 N to 23.5 S

• -45 to +45 degrees

• -66 to +66 degrees

If you were in a town located at 17° S Latitude, how many days a year would the Sun be directly overhead (at the Zenith) at noon?

• 1 day

• 2 days

• 0 days

• 365 days

• 30 days

The range of declination of the Sun's ecliptic is 47 degrees. HINT: What is half of 47?

• True

• False

The Sun's path moves above and below the equator about 23.5° throughout the year. What is the cause of this motion?

• The tilt of the Earth's axis

• The distance the Sun is to the Earth

• The carbon dioxide content in our atmosphere

• Lunar forces towards the Sun

Which statement about declination (north-south coordinates) is FALSE?

• Polaris is almost at +90 degrees.

• It is much like latitude on the earth's globe.

• Its origin (i.e. 0°) is the celestial equator

• It is measured eastward in units of time.

Which is NOT a reason that we have seasons?

• Earth's tilt

• Earth's revolution

• The sun's latitude (location in the sky)

• Earth's rotation

Indirect rays cause...

• decreased temperature

• increased temperature

• consistent temperature

• It depends on how direct

What is the longest day of the year in the Northern Hemisphere?

• December 21

• June 21

• September 21

• March 21