If we divide that arc minute into 60 equal parts we get an arc second . You know, of course, that we observe at night because then we can see astronomical objects that are not apparent in the daylight. As you do your observations, information about the apparent position of the sun on your observation days will be important. The universe is a very big space. Since the time we can spend on this lab is limited, here are some suggestions for locating some galaxies.
Right ascension is a coordinate for measuring the east-west location of astronomical objects.
This can be compared to a line of longitude on the earth. Declination is the angular distance north or south of the celestial equator. It can be compared to a line of latitude on the earth. We have a two-dimensional image of a galaxy. In our investigation, we will plot the intensity versus position in the galaxy of many pixels along a straight line, or slice .