The telescope, camera, and computer that you will be using are small compared to equipment used by professional astronomers. However, the process that you will be involved in will closely reproduce the work of actual research programs being carried out by astronomers. As magnification increases, the field of view decreases . When we are standing on solid ground we can easily measure distances in standard units like meters, kilometers, feet and miles, etc. Objects in the sky can't be measured the same way.
Astronomers use degrees to give the relative placement of objects.
If one object is now directly overhead and one is on the horizon, they would be 90 o apart. Since many astronomical measurements are smaller than a degree, even smaller units have to be used. If we divide a degree into sixty equal parts, we get an arc minute . 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.