An area of the celestial sphere occupied by one of the88 recognized constellations. 星座區域天球上88個(gè)已被確認的星座中的一個(gè)所占據的區域
A polar projection of half or more of the celestial sphere on a chart equipped with an adjustable overlay to show the stars visible at a particular time and place. 星座一覽圖天體球的一半或多半在平面圖上的極投影圖，這種圖具有可調節的遮蔽物以顯示在給定時(shí)刻和位置可見(jiàn)的恒星
A point on the celestial sphere directly below the observer, diametrically opposite the zenith. 天底天球上，在觀(guān)測者垂直向下的一點(diǎn)，與天頂完全相對
