Page 1 1. (10 marks) The constellation Cygnus, shown below, is now in our evening sky, 21 27 21 1 CEPHEUS 60 DRACO Lucia CYGNUS V PECULA PEGASUS SAGITTA DELPHINUS 27 HAU SKY On the map the "X" axis is in the East-West direction in units of time, with 1h = 15". The map's "Y" axis is in the North-South direction in units of degrees. Many of the stars are labeled with Greek letters. For example, the brightest star, named Deneb, has the label a. Deneb is one of the stars in the "Summer Triangle" and is about 2,616 light-years from Earth. The second brightest star in Cygnus, named Albireo with the letter 3 on the map, is about 430 light-years from Earth. It radiates less light than Deneb, but appears nearly as bright because it is closer to Earth. (a) Use the diagram to find the separation between Deneb and Albireo in degrees. (b) Using a cross staff with a cross piece that is 50 mm long, how far down the cross staff from your eye would the cross piece be located to match the angular separation between Deneb and Albireo? continued on page 2 Page 1 1. (10 marks) The constellation Cygnus, shown below, is now in our evening sky, 21 27 21 1 CEPHEUS 60 DRACO Lucia CYGNUS V PECULA PEGASUS SAGITTA DELPHINUS 27 HAU SKY On the map the "X" axis is in the East-West direction in units of time, with 1h = 15". The map's "Y" axis is in the North-South direction in units of degrees. Many of the stars are labeled with Greek letters. For example, the brightest star, named Deneb, has the label a. Deneb is one of the stars in the "Summer Triangle" and is about 2,616 light-years from Earth. The second brightest star in Cygnus, named Albireo with the letter 3 on the map, is about 430 light-years from Earth. It radiates less light than Deneb, but appears nearly as bright because it is closer to Earth. (a) Use the diagram to find the separation between Deneb and Albireo in degrees. (b) Using a cross staff with a cross piece that is 50 mm long, how far down the cross staff from your eye would the cross piece be located to match the angular separation between Deneb and Albireo? continued on page 2