Aeronautical is the describing word for things that belong to aeronautics: the science and engineering of how planes (and similar flying machines) are designed and flown. An aeronautical engineer works on aircraft; aeronautical charts are maps pilots use.

Aeronautical is the describing word for things that belong to aeronauticsaeronautical是用來形容跟aeronautics航空學有關的東西的形容詞 the science and engineering of how planes (and similar flying machines) are designed and flown，aeronautics就是研究飛機（和類似飛行器）怎麼設計、怎麼飛的科學與工程。 An aeronautical engineer works on aircraftan aeronautical engineer航空工程師負責處理飛機相關的工作 aeronautical charts are maps pilots use；aeronautical charts航空圖則是飛行員用的地圖。

Though actually, everyday English often prefers aviation or aircraft (aviation industry, aircraft engineer). Aeronautical sounds more like a textbook or a job title.

Though actually, everyday English often prefers aviation or aircraft不過日常英文其實比較常用aviation或aircraft這兩個字 (aviation industry, aircraft engineer)（像aviation industry航空業、aircraft engineer飛機工程師）。 Aeronautical sounds more like a textbook or a job titleaeronautical聽起來比較像教科書用語，或是職稱。

It is not a noun: you do not study aeronautical on its own — you study aeronautics, or you do aeronautical engineering. And it is about flight in the air around Earth, not travel in space; that neighbouring idea is astronautical or aerospace.

It is not a nounaeronautical不是名詞 you do not study aeronautical on its own，你不會單獨去『study aeronautical』 you study aeronautics, or you do aeronautical engineering，而是study aeronautics（研究航空學），或do aeronautical engineering（做航空工程）。 And it is about flight in the air around Earth而且它講的是在地球大氣層裡飛行 not travel in space，不是在太空旅行 that neighbouring idea is astronautical or aerospace；相近的那個概念是astronautical或aerospace（太空／航太）。