平黃經




平黃經是在太空動力學或天體力學中，天體在 軌道傾角為0的假想圓軌道上運動的黃經值。平黃經對時間的變化是一個常數，只有在近心點與遠心點的值會與真黃經相同。



計算


平黃經L{displaystyle L,}L,可以由下式計算：


L=M+ω¯=M+Ω+ω{displaystyle L=M+{bar {omega }}=M+Omega +omega ,}{displaystyle L=M+{bar {omega }}=M+Omega +omega ,}

此處：




  • M{displaystyle M,}{displaystyle M,}是軌道的平近點角，


  • ω¯{displaystyle {bar {omega }},}{displaystyle {bar {omega }},} 是軌道的近心點經度，


  • Ω{displaystyle Omega ,}Omega ,是升交點黃經和


  • ω{displaystyle omega ,}omega ,是近心點角
















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