AST352L--Spring 1998

Astrolabe Practice

This assignment is DUE on Wednesday, February 4.

1. Find the star Procyon.

1. What is the right ascension of Procyon?
2. What is the declination of Procyon?

2. Set your astrolabe so that the star Procyon is East of the meridian, at an altitude of 50 degrees.

1. What is the hour angle of Procyon?
2. What is the sidereal time?
3. Verify that the formula Hour Angle +Right Ascension =Sidereal Time is satisfied by 1 and 2 for Procyon (use the information you got in the first part of the problem).
4. What is the azimuth of Procyon? Be sure to specify the azimuth convention you are using.
5. What is the local apparent solar time on February 1?
6. What is the local mean solar time on February 1?
7. What is the Central Standard Time on February 1?

3. Set your astrolabe for 22 hours, local apparent solar time, on February 1.

1. What is the altitude of Procyon?
2. What is the azimuth of Procyon?
3. What is the hour angle of Procyon?
4. What is the sidereal time?

4. Set your astrolabe so that the hour angle of Procyon is -3 hours (i.e., East of the meridian). Assume the date is February 1.

1. What is the altitude of Procyon?
2. What is the sidereal time?
3. What is the local apparent solar time?