meaning: sky, heaven
天（テン、あめ）: the sky, the air, the heavens
天下（テンカ）: the world, the whole land
天才（テンサイ）: a genius
天災（テンサイ）: a natural disaster, an act of God
天使（テンシ）: an angel
天井（テンジョウ）: a ceiling
天職（テンショク）: one’s vocation, a mission (in life)
天体（テンタイ）: a heavenly body, a celestial sphere
天地（テンチ、あめつち）: heaven and earth, the universe
雨天中止（ウテンチュウシ）: cancellation because of rain, a rainout
晴天（セイテン）: fine weather, a clear sky
天下り（あまくだり）: the practice of former government officials finding employment in the private sector
天の川（あまのがわ）: the Milky Way
There seem to be a few different theories how the character #天 was formed but it is the combination of 一 (No.1) and 大 (big) and I think 天 can be the biggest thing we can see from the earth as it is endless, so that makes sense.
天 is listed under the radical of 大.
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