I don't believe these tags add anything to the question. But I don't want to just remove them as there are some others around the fringes that I'm unsure about. astronomy is often used alongside sunrise and sunset, however, as it's a natural science rather than a product or a computing concept and I think this should be burninated as well.
On a Q&A site about programming, sunrise, and sunset seem to add too much details that are not useful for understanding the question. I could understand astronomy to mean "code about concepts usually relevant on astronomy," but not a tag for every term used in astronomy.
stars seems used for review stars, asterisks (it seems so in Printing *s as triangles in Java?), star field (as in Scrolling starfield with gl_points in pyglet), stars assigned to messages (as in Will a function be added to Gmail App Script API to get the type of star assigned to a message?), the
I am not sure astronomy is really necessary.
I was looking for a statement about the tags purpose and what I could find was in the "About" page, where it says: "All questions are tagged with their subject areas.". As such, I don't see why
astronomy could also include those questions related to other celestial objects. I've already retagged a few of the questions that were on stars, and one question I found tagged with galaxy that was not about the tablet leaving them with astronomy