AST101H1 Lecture Notes - Lecture 2: Minute And Second Of Arc

• School: UTSG
• Department: Astronomy & Astrophysics
• Course: AST101H1
• Professor: Ian Shelton

Document Summary

Superior (outer) planets - mars, jupiter, saturn etc. Rising and setting times the time when an object intersects the horizon. Transit time the time when an object crosses the meridian the meridian is the circle on the sky joining north to south. Opposition a planet is in opposition when it lies on the opposite side of the sky with respect to the sun (180 degrees away). the full moon is in opposition. Maximum elongation the inferior (inner) planets are never at opposition they reach a maximum angle from the sun called maximum elongation they undergo superior and inferior conjunctions. Ab: measure length ab, measure angles a and b, determines ac and bc. The distance to the planets e. g. two observers on opposite sides of the earth measure the position of mars at the same time baseline of the triangle is nearly the diameter of the earth.