If you were to make a discovery that turns the field of Astronomy upside down, Who would you report it to?

If you were to make a discovery that turns the field of Astronomy upside down, you would know "who to report it to".

You would report asteroid discoveries to Brian Marsden, except he died in 2010. I don't know who recognizes discoverers now.

The comedy channel would be one place. You are rejecting thousands of years of observation and science

Id keep it to myself and giggle about it several times a day.

nearest astronomy professor (high school or college)

You send it to the usual astronomical journals, "Nature" or "Science". It will be checked for mathematical accuracy and logic. Your first draft will likely be rejected with suggestions to make it more clear. If you get through that then it will appear in print and on-line.

My Local Planetarium in Armsgh

The International Astronomical Union.

Submit a paper to the Astrophysical Journal (after checking their formatting and submission requirements); they will send it to referees for evaluation. To save embarrassment (and time), you might first ask a friend who has a degree in physics or astronomy to take a look.

If it's a genuine one, I'd contact a local university that has astronomy to verify your results.