北(粵拼:bak1),或者叫北方,係指東同西中間嘅方向,同南相反。而正北係正東同正西正中間嘅方位,正北同正東或正西垂直,符號N,來自英文North。用真方位角表示,係000度,符號000°,用羅經方位角,係N0°E或者N0°W。
北相反方向係南。正北相反就係正南。
北極亦指最北嘅地方。
引伸
正北同磁北
正北(True North)就係人定義嘅北極,磁北(Magnetic North)就係指南針支針指嘅北邊。正北同磁北係相差幾度,哩個角度,叫(Magnetic declination),亦隨住唔同地點有差別。相差係因為地球磁場產生嘅北同埋正北嘅唔同所致。
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.