Oge Ephemeris

Okwu ephemeris oge (nke a na-akpọkarị ET ) nwere ike n'ụkpụrụ na-ezo aka na oge na-akpata na ephemeris ọ llala (njem nke trajectory nke ihe mbara igwe).  N'ime omume omume ya nke ọma iji rụtụ aka:

1. Ọkọlọgụ oge nke mbara igwe nakweere na 1952 site n'aka ndị IAU, ^[1] ma dochie ya n'ime 1970s. ^[2] A tụrụ aro oge a na 1948, iji merie adịghị ike nke oge na-agbanwe agbanwe oge anwụ pụtara oge anwụ . Ebumnobi ahụ bụ ịkọwa oge otu (dị ka ọ ga-ekwe omume) dabere na echiche Newtonian (lee n'okpuru: Nkọwa nke oge ephemeris (1952) ). Oge Ephemeris bụ ngwa mbụ nke echiche nke oge na-agbanwe agbanwe, bụ nke a na-akọwa oge na oge n'ezoghị ọnụ, sitere na ọnọdụ a hụrụ nke ihe na-enyocha mbara igwe site n'echiche na-akpali akpali nke mmegharị ya. ^[3]
2. oge nhazi oge relativistic nke ọgbara ọhụrụ, nke JPL ephemeris arụmụka oge arụmụka T _eph mebere, n'usoro nke mmepe Ephemerides n'usoro ọnụọgụgụ. Otu n'ime ha bụ DE405 ephemeris na ojiji zuru ebe niile ugbu a. Ọnụ ọgụgụ oge nke T _eph na-anọchi anya ya nwere njikọ chiri anya, ma dị iche (site na nkwụsịtụ na ọnụego oge niile) site na, oge TCB nke nakweere ugbu a dị ka ọkọlọtọ site na IAU (lee n'okpuru: JPL ephemeris time arụmụka Teph ). ^[4]

Ọtụtụ n'ime ngalaba ndị a metụtara oge ephemeris nke ọkọlọtọ 1952.

^{[5] [6]}Otu echiche na-ebilite mgbe ụfọdụ na a na-eji oge ephemeris eme ihe site na 1900: nke a nwere ike iji n'ihi na ET, ọ bụ ebe na ihe aro ma nakweere na oge 1948-1952, akọwara n'ụzọ  zuru ezu site n'iji usoro ndị mere nlegharị anya iji oge oge nke 1900 January 0 na Tebụlụ Sun nke Newcomb

Oge ephemeris nke ọkọlọtọ 1952 na-ahapụ ihe nketa na-aga n'ihu, site na iche ihe mere eme ya nke abụọ ephemeris nke ekiri nke a na-achị chiri anya n'ochie ọkọlọtọ SI nke abụọ dị ugbu a (lee n)  'okpuru: redefinition nke abụọ).

Site n'oge John Flamsteed (1646–1719) kwenyela na ntụgharị ụwa kwa ụbọchị bụ otu.  Ma mgbe e ịhụ na iri na-egosi na ngosi nke iri abụọ na-abụ afọ, na-amụba nke astronomical nha, ọ na-enyo enyo, na e gosiri guzosie ike, na adiana nke ọnwụ ( ie ogologo nke ụbọchị ) ịrịba irregularities.  na oge oberekpa, na na-agbadata ogologo oge n'ogologo oge.  W de Sitter chị ụgbọ ihe nri ahụ (1927) [1] bụ onye dere "Ọ bụrụ na anyị na-anabata echiche a, mgbe ahụ 'oge astronomical', nke ntụgharị ụwa nyere, ma jiri ya mee ihe na niile bara uru nke mbara igwe.  , dị iche na 'uniform'.ma ọ bụ oge 'Newtonian', nke akọwara dị ka ike n'onwe ya nke nha nhata nke igwe igwe".  De Sitter nyere mgbazi ka etinyere ya na oge anwụ nke ntụgharị ụwa nyere iji gba oge otu.

1. ↑ 'ESAE 1961': 'Explanatory Supplement (1961), esp. p. 9.
2. ↑ 'ESAA (1992)': P K Seidelmann (ed)., especially at pp. 41—42 and at p. 79.
3. ↑ B Guinot and P K Seidelmann (1988), at p. 304—5.
4. ↑ E M Standish (1998).
5. ↑ S Newcomb (1895).
6. ↑ For the components of the definition including its retrospective aspect, see G M Clemence (1948), esp. p. 172, and 'ESAE 1961': 'Explanatory Supplement (1961), esp. pages 69 and 87.