hm2_2017 - ASTR0 81 - Assignment #2 due Friday of Week #2...

ASTR0 81 - Assignment #2
due Friday of Week #2 before noon
To get full credit for these problems you need to show all your work. Longer problems with
more sub-parts are typically worth more points.
Numbers in brackets refer to [Chapter].[Problem Number] in Karttunen et al.; note that
solutions are in the back for these problems and to get credit for these problems you need to
show all your work.
1. The Earth rotates once per “day” which by common definition equates 24 hours from
one noontime to the next. Through what angule does the earth rotate in one minute?
How long does it take a celestial object to move west by one minute in right ascension?
How far does this object travel in right ascension? How far deos this object travel
across the sky in one hour?
2. (a) List the right ascension and declination of the Sun when it is located at vernal
equinox, the summer solstice, the autumnal equinox, and the winter solstice.
(b) Calculate the altitude of the Sun along the meridian on the first day of summer