Let's talk about celestial coordinates. To look up the right ascension and declination of various objects in the sky, you can search for the object in the database SIMBAD.

0:00 Intro
0:23 Equatorial Coordinate System
1:41 Declination
3:15 Right Ascension
4:55 Summary

Sources:
American Institute of Physics (https://www.aip.org/sites/default/fil...)
The John A. Dutton eEducation Institute, PennState (https://www.eeducation.psu.edu/eme81...)
Navigation and Ancillary Information Facility (https://naif.jpl.nasa.gov/pub/naif/to...)
Prof. Michel van Biezen (http://www.ilectureonline.com/lecture...)
Hong Kong Observatory (https://www.hko.gov.hk/en/gts/astrono...)
SIMBAD (http://simbad.ustrasbg.fr/)