AST101H1 Lecture Notes - Lecture 4: Light Pollution, Angular Diameter

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Bryan Gaensler

Document Summary

Ast 101 lecture 4 the night sky. We also have our own perceptions of what ursa minor may look like: polaris is the brightest star in the constellation of ursa minor. If you were to be at the equator you would see polaris on the horizon. If (cid:449)e (cid:449)ere at the south pole (cid:455)ou (cid:449)ould fi(cid:374)d polaris (cid:271)elo(cid:449) the horizo(cid:374) (cid:894)(cid:449)o(cid:374)"t be able to see) In toronto, you would see polaris at 45 degrees. The rotation of the earth: you can see different constellations at different times of the year, at june 21, at noon if you look straight up you will see the sun. Then at midnight if you look straight up you will see ophiuchus: earth spins once a day and rotates around the sun once a year. There would be almost no seasons at all. The angular size of an object depends on: how big it is.