天魚[amago] land-locked variety of red-spotted masu trout (Oncorhynchus masou ishikawae)
御天気[otenki] weather
コール天[kooruten] corded velveteen
破天連[pateren] Portuguese Jesuits (in Japan in the 16th century)
天鵝絨[tengajuu] velvet

悪天[akuten] bad weather
悪天候[akutenkou] bad weather
悪天使[akutenshi] evil angels
旭日昇天[kyokujitsushouten] full of vigor and vitality (like the rising sun) (vigour)
一天[itten] the whole sky

観測[kansoku] observation
観測ヘリコプター[kansokuherikoputaa] observation helicopter
計測[keisoku] measurement
再測量[saisokuryou] resurvey
三角測量[sankakusokuryou] triangulation

実測[jissoku] survey
実測図[jissokuzu] measured map
写真測量[shashinsokuryou] photographic surveying
推測[suisoku] guess
測候所[sokkoujo] weather measurement station