1. Explain how sailors on a ship traveling parallel to a coastline at a known speed can use parallax angle measurements to determine the distance to the shore. 2. Suppose that a dim star were located...

1. Explain how sailors on a ship traveling parallel to a coastline at a known speed can use parallax angle measurements to determine the distance to the shore.

2. Suppose that a dim star were located 2 million AU from the Sun. Find (a) the distance to the star in parsecs and (b) the parallax angle of the star.

3. How many times brighter is a star of apparent magnitude m = +1 than a star of apparent magnitude m
7?