P - perihelion 中文 - EN166

perihelion n.(pl. -helia ) 【天、宇】(行星或彗星運...

peril
The results show that the solar mass - loss extends the semi - major axis , the distance at perihelion and orbital periods of the meteor streams , especially , the extensive influence on the semi - major axis is not overlooked , but this influence on other orbital elements may be neglected 其計算結果表明，太陽質量損失使流星群軌道半長軸每世紀的改變效應較明顯，它們同太陽距離的擴大影響值得關注，但對軌道周期的拉長每世紀的影響甚小，對近日點經度只有量級變化小到可以略而不計。
The various colours significant of various degrees of vitality white , yellow , crimson , vermilion , cinnabar : their degrees of brilliancy : their magnitudes revealed up to and including the 7th : their positions : the waggoner s star : walsingham way : the chariot of david : the annular cinctures of saturn : the condensation of spiral nebulae into suns : the interdependent gyrations of double suns : the independent synchronous discoveries of galileo , simon marius , piazzi , le verrier , herschel , galle : the systematisations attempted by bode and kepler of cubes of distances and squares of times of revolution : the almost infinite compressibility of hirsute comets and their vast elliptical egressive and reentrant orbits from perihelion to aphelion : the sidereal origin of meteoric stones : the libyan floods on mars about the period of the birth of the younger astroscopist : the annual recurrence of meteoric showers about the period of the feast of s . lawrence martyr , 10 august : the monthly recurrence known as the new moon with the old moon in her arms : the posited influence of celestial on human bodies : the appearance of a star 1st magnitude of exceeding brilliancy dominating by night and day a new luminous sun generated by the collision and amalgamation in incandescence of two nonluminous exsuns about the period of the birth of william shakespeare over delta in the recumbent neversetting constellation of cassiopeia and of a star 2nd magnitude of similar origin but lesser brilliancy which had appeared in and disappeared from the constellation of the corona septentrionalis about the period of the birth of leopold bloom and of other stars of presumably similar origin which had effectively or presumably appeared in and disappeared from the constellation of andromeda about the period of the birth of stephen dedalus , and in and from the constellation of auriga some years after the birth and death of rudolph bloom , junior , and in and from other constellations some years before or after the birth or death of other persons : the attendant phenomena of eclipses , solar and lunar , from immersion to emersion , abatement of wind , transit of shadow , taciturnity of winged creatures , emergence of nocturnal or crepuscular animals , persistence of infernal light , obscurity of terrestrial waters , pallor of human beings 顯示出不同程度之生命力的繽紛色彩白淺黃深紅朱紅銀朱諸星之亮度一直包括到七等星以等級標志的諸星之大小諸星的位置御夫座沃爾辛厄姆路172大衛的戰車173土星光環螺旋星云凝固后形成有衛星的恒星群兩重大陽相互依存的旋轉運動伽利略西蒙馬里烏斯174皮亞175勒威耶赫歇耳加勒176等人各自獨立地同時所做的發現波得和開普勒所嘗試的距離的立方與回轉次數的平方的體系化177多毛的眾彗星178那幾殆無限的被壓縮性，以及自近日點至遠日點那廣漠的遠心的重返大氣層的橢圓軌道隕石的恒星之起源年紀較輕的天體觀測者誕生的那個時期火星上所出現的“暗波”現象179每年在圣勞倫斯節殉教者，八月十日前后降落的隕石雨每月都發生的所謂“新月抱舊月”現象180關于天體對人體的影響的假定威廉莎士比亞出生的時期，在斜倚卻永不沒落的仙后座那三角形上端，一顆不分晝夜散發著極亮光彩的星辰一等星出現了181這是兩個無光死滅了的太陽因相撞并汞合為白熱體而形成的燦爛的新太陽大約在利奧波德布盧姆出生時，出現在七星花冠星座里而后又消失了的一顆同一起源亮度卻稍遜的星宿二等星182還有約于斯蒂芬迪達勒斯出生時，出現在仙女座中之后又消失，小魯道爾夫布盧姆出生與夭折數年后出現于御夫座后又消失，以及另外一些人出生或去世前前后后出現在許許多多其他星座中而又消失了的假定是同一起源的實際存在或假定存在的星斗183 。
The asteroids are the most important small bodies in the solarsystem , and they mainly lies in the two locations - a main belt between the mars ' s orbit and the jupiter ' s and the near - earth space . the most feature of the orbits of near - earth asteroids ( neas ) is that the semi - major axes of the orbits are nearly equal to that of the earth or the perihelia distances are approximate to or even less than the mean distance between the sun and the earth , thus they could move into inside of the earth ' s orbit , so that they might close approach or even colliside with the earth ( or other planets , such as the venus , the mars , etc . ) . the characteristic brings about some difficulties in the numerical research during their orbital evolution , which leads to the failure of the normalization technique in the general removal impact singularities of celestial mechanics methods and the symplectic algorithm which is successfully applied to the investigation in quality . by comparing the computation effects of several common numerical methods ( including symplectic algorithm ) , and considering the nature of the movement of the small bodies , the corresponding treatments are provided here to improve the reliability of the computation 小行星是太陽系最重要的一類小天體，主要分布在兩個區域；火星和木星軌道之間的一條主帶和近地空間.近地小行星軌道的最大特點是其軌道半長徑與地球軌道半長徑相近，或近日距離接近甚至小于日地平均距離，其運動可深入到地球軌道的內部，這將導致該類小行星與地球(還有金星、火星等)十分靠近甚至發生碰撞.這一特征給其軌道演化數值研究帶來一些困難，包括天體力學方法中一般消除碰撞奇點的正規化處理以及對定性研究十分成功的辛算法都將在不同程度上失效.通過對幾種常用數值方法(包括辛算法)計算效果的比較，根據小天體運動自身的特性，給出了相應處理措施，從而可提高計算結果的可靠性
The most feature of the orbits of near - earth asteroids ( neas ) is that the semi - major axes of the orbits are nearly equal to that of the earth or the perihelia distances are approximate to or even less than the mean distance between the sun and the earth , thus they could move into inside of the earth ' s orbit , so that they might close approach or even colliside with the earth ( or other planets , such as the venus , the mars , etc . ) 近地小行星軌道的最大特點是其軌道半長徑與地球軌道半長徑相近，或近日距離接近甚至小于日地平均距離，其運動可深人到地球軌道的內部，這將導致該類小行星與地球（還有金星、火星等）十分靠近甚至發生碰撞。
The numerical computation for the secular variable of the semi - major axis , solar distance at perihelion , orbital periods and longitude of perihelion has been made for fifteen meteor streams by using the solution of gylden - meshcherckii equations 利用g - m型變質量天體軌道根數變化方程的一階和二階解對15個流星群軌道半長軸、近日點距離、軌道周期和近日點經度因太陽質量損失造成的每世紀的長期改變效應做了數值計算，并得出計算結果。
Draconid meteor shower , associated with comet 21p giacobini - zinner , is not a major meteor showers throughout the year . it approaches the sun every 6 . 61years . if the earth is near the comet s perihelion during that period , a stronger meteor shower may occur 它的母體是21p giacobini - zinner彗星，每6 . 61年回歸一次，若當時地球較接近彗星的近日點，便有可能出現較可觀的流星雨。
Comet giacobini - zinner passed the perihelion on 3 july this year , it is still relatively close to the earth in october . some astronomers predicted that draconids may be worth watching this year Giacobini - zinner彗星今年在7月3日通過近日點，至10月時與地球尚算接近，因此有天文學家認為今年可能會出現較可觀的天座流星雨。
Advance of perihelion 近日點前移
Advance of the perihelion 近日點前移
A comet is at perihelion when it is closest ( = very close ) to the sun 彗星最接近太陽時，它就是在近日點。
The anomalistic year is the time between successive transits of the earth through the perihelion . 近點年是地球連續兩次通過近日點之間的時間。