That’s a classification scheme created by Annie Jump Cannon in the early 1900s based on stellar spectra.
这是 Annie Jump Cannon 在 1900 年代初期根据恒星光谱创建的分类方案。
万物简史
One Harvard computer, Annie Jump Cannon, used her repetitive acquaintance with the stars to devise a system of stellar classifications so practical that it is still in use today.
It's a little weird, but many people use the mnemonic, “Oh Be A Fine Guy, Kiss Me, ” or “Oh Be A Fine Girl, Kiss Me, ” to remember it — which was dreamed up by Annie Jump Cannon herself!
这有点奇怪,但很多人会用“Oh Be A Fine Guy, Kiss Me”或“Oh Be A Fine Girl, Kiss Me”来记忆——这是安妮·加农自己想出来的!