The Armillary Sphere浑仪thearmillaryspherewasanastronomicobservatoryinstrumentinancientchina.theancientpeoplebelievedtheaven Juss withthestarsintheskyresemblingtheroundpillsbesetintheshellandtheearthliketheyolk.peopleusedthearmillaryspheretoexaminethephe s 古人指出天空是圆的，形状像蛋壳，经常出现的星星在蛋壳上是八角形的弹丸，地球是蛋黄。人们用星盘用这个蛋黄测量天体的方位。thearmillarysphere’sstructurewasverysimpleattheverybeginning， withthreeringsandametalaxis.theoutermostring-meridian ring-wasfixedinthenorth-south direction， themiddlering-equator ring-wasparalleltotheearth’se-quatorialplane， andtheinnermostone-chijingring-couldrevolvearoundthemetalaxis.thechijingringandthemetalaxisintersectedattwopoints withonepoints thertothesouthpole.anobservatorytubewasfixedonthechijingringandcouldrotatearoundthecenner最外侧的圆环是一样的，所以朝南北方被称为“子午线” 中间的同一圆环与地球赤道面平行，被称为“赤道环”。最里面的圆环可以绕金属轴旋转，被称为“红经环”。

红经环与金属轴共线2点，1点指北天极，另1点指南天极。whenusedforexaminingthepositionofstars，thetubewasfirstaimedatacertainstar。thenthegraduationontheequatorandchijingringswasusedtopin-point the star’spositioninthesky .在红经环面安装了望筒，可以围绕红经环的中心旋转。Later，inordertofacilitatetheobservationofmorecelestialbodies，such as the sun，the planets，and the moon，moreringswereaddedinsidete makingitamulti-purposeastronomicinstrument .之后，古代人为了容易观测太阳、行星、月亮等天体，浑身是泥。

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