(uranography) Summer Triangle - a bright asterism of the northern summer sky. Its corners are the stars Altair, Deneb, and Vega.

all you can eat

modern times, variously described as encompassing the Renaissance, the Age of Discovery, the Reformation and the rise of modern capitalism; or from the Meiji Restoration to the end of the Pacific War, which is then followed by 現代 (gendai)

a historical period where social disorder is so great due to war, disease, political disorder etc. that there is little or no cultural development; Dark Ages

(construction, architecture) The large, central pillar that holds up a traditional Japanese house. / The breadwinner of a household or organization.

aorta

a private university

algebraic equation (mathematical equation)

huge, gigantic, enormous, massive / swollen and large

one's masterpiece, one's representative work