Ịgba Mgba Mgba

Almucantar (a na-a mmetụtakwa almucantarat ma ọ bụ almacantara ) bụ ibu dị n'elu mbara igwe nke yiri mbara .  Kpakpando abụọ dina n'otu almucantar nwere otu ugwu.

Ewebatara okwu a na mbara igwe nke Europe site n'aka onye mọnk na-ahụ mbara igwe Hermann Contractus nke Reichenau, Latinized site na okwu Arabic al-muqanṭarah ("the almucantar, sundial", plural: al-muqanṭarāt ), nke sitere na  qanṭarah ("arch, bridge")

Mkpara almucantar bụ ngwa a na-emeka oge mgbatị ahụ na-egosi, iji mmegide n'azụ na n'ihi ya, nke kompas .  A na-ahụ osisi pear ma ọ bụ igbe igbe eme ya, nke nwere mgbaba nke 15° ruo 30°, [1] ọ bụ ihe atụ nke onye ọrụ azụ .

Anyanwụ na-atụgharị onyinyo nke vane (B n'onyinyo dị n'akụkụ) na mbara ihu (A). Vane Horizon nwere oghere ma ọ bụ oghere iji mee ka onye na-ekiri ya hụ mbara n'ebe dị anya. Onye na-ekiri ihe na-edozi mbara ihu na onyinyo ka ha na-egosi n'otu oge ahụ na mbara igwe ma na-edozi vane ịhụ anya (C) iji kwado anya anya ya na mbara igwe. Ebe dị elu nke anyanwụ bụ akụkụ dị n'etiti vane onyinyo na ebe a na-ahụ anya (BAC).