Final answer:
The information provided is unrelated to finding the circumcenter of triangle ABC, and without a diagram or additional context, it is not possible to determine the circumcenter's location.
Step-by-step explanation:
To determine which point is the circumcenter of triangle ABC, we need to understand that the circumcenter is the point where the perpendicular bisectors of the sides of the triangle intersect. However, the provided information is not directly about triangle ABC and doesn't mention points X, T, R, or Y. Also, the details provided seem to be related to other geometrical and physics concepts like the size of the Moon in the sky, right triangles, and vector components, which do not give us information about the circumcenter of triangle ABC. Without a diagram or additional context, it's impossible to accurately determine the position of the circumcenter.