LOYOLA COLLEGE (AUTONOMOUS), CHENNAI – 600 034
B.Sc. DEGREE EXAMINATION – MATHEMATICS
THIRD SEMESTER – NOVEMBER 2010
MT 3502/MT 5503 – ASTRONOMY
Date : 02-11-10 Dept. No. Max. : 100 Marks
Time : 9:00 – 12:00
PART – A
Answer ALL Questions (10 x 2 = 20 marks)
- Define diurnal motion of a star.
- Define ecliptic.
- Define Equinoxial points.
- What is the effect of refraction on the position of a celestial body?
- Define geocentric parallax.
- State Kepler’s laws of planetary motion.
- Define age of the moon.
- Define annular eclipse.
- What are inner planners?
- Write a note on Asteroids.
PART – B
Answer any FIVE Questions (5 x 8 = 40 marks)
- Define sidereal time and prove that its is equal to R.A ± hour angle of a star.
- Define circumpolar star and find the condition for any star to be circumpolar.
- Trace the changes in the length of the day for a place on earth’s equator.
- Compare refraction and geocentric parallax.
- Find the effect of refraction on R.A and declination of a star.
- Define sidereal month and synodic month for the moon and find the relation between them.
- Compare solar and lunar eclipses.
- Write a note on comets.
PART – C
Answer any TWO Questions (2 x 20 = 40 marks)
- a) Explain the equatorial system to fix a celestial body. Bring out the merits and demerits. (10)
- b) Define twilight and find the condition for twilight to last the whole night. (10)
- a) Derive Newton’s deductions from kepler’s laws. (12)
- b) Define equation of time and prove that it vanishes four times a year. (8)
- a) Derive tangent formula for refraction.
- b) Explain different calendars.
- a) Trace the changes in the elongation and phases of the moon in one lunation.
- b) Find the maximum number of eclipses in a year.
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