授时历

Multi tool use
Multi tool use








《授时曆》是中国古代曾经使用过的一种曆法，为元代郭守敬、王恂、许衡等人创制，因古语“敬授人时”而得名，从元朝至元十八年（西元1281年）开始实行。明朝所颁行的《大统曆》天文數據和推步方法，都依照授時曆[1]，惟《大统曆》不計算斗分差（不考慮回歸年古長今短。）；可說授時曆总共实行了402年。


《授时历》应用弧矢割圆术来处理黄经和赤经、赤纬之间的换算，并用招差术推算太阳、月球和行星的运行度数。《授时曆》采用统天曆的长度，365.2425日为一年，29.530593日为一月，与现在所使用的公曆的数值完全相同，但《授时历》比公历早推行301年。推算节气的方法是将一年的1⁄24作为一气，以没有中气的月份为闰月。它正式废除了古代的上元積年[2]，而逕取至元十八年為为历元，所定的数据全凭实测，打破古代製曆的习惯，是中国历法上的大变革之一。



参考文献





  1. ^ 邓文宽：《国家图书馆藏明代大统历日汇编》前言


  2. ^ 曲安京. 中国历法与数学. 2005. 



  • 席文：〈为什么《授时历》受外来的影响很小？〉。
























































































































































































































W GXC sh,tiEdvaPF J Y aMzG bOmGjhf5oN1pIdu5BiLOXxF4vM5h,a1Kw8cvXdZtOKrmmaVWapE44jUxjG
-
JZoNldS,PvktJlr 6,qheUrxlUNkeJBmKZri6 I eH1K5C

Popular posts from this blog

Y

Image
This article is about the letter of the alphabet. For other uses, see Y (disambiguation). See also: Wye (disambiguation) Y Y y (See below) Usage Writing system Latin script Type Alphabetic and Logographic Language of origin Latin language Phonetic usage [ y ] [ ɨ ] [ j ] [ iː ] [ ɪ ] [ ɘ ] [ ə ] [ ɯ ] [ ɛː ] [ j ] [ ɥ ] [ ɣ̟ ] / w aɪ / / aɪ / Unicode value U+0059, U+0079 Alphabetical position 25 History Development Υ υ 𐌖 Y y Time period 54 to present Descendants  • U  • V  • W  • Ỿ  • ¥  • Ꮙ  • Ꮍ  • Ꭹ Sisters F Ѵ У Ў Ұ Ү ו و ܘ וּ וֹ ࠅ 𐎆 𐡅 ወ વ ૂ ુ उ Variations (See below) Other Other letters commonly used with y(x), ly, ny This article contains IPA phonetic symbols. Without proper rendering support, you may see question marks, boxes, or other symbols instead of Unicode characters. For an introductory guide on IPA symbols, see Help:IPA. ISO basic Latin alphabet Aa Bb Cc D...
Read more

Mount Tamalpais

Image
Mount Tamalpais Mount Tamalpais, viewed from the south Highest point Elevation 2,571 ft (784 m)   NAVD 88 [1] Prominence 2,456 ft (749 m)  [1] Listing California county high points 55th Coordinates 37°55′45″N 122°34′40″W  /  37.929088°N 122.577829°W  / 37.929088; -122.577829 Coordinates: 37°55′45″N 122°34′40″W  /  37.929088°N 122.577829°W  / 37.929088; -122.577829   [1] Geography Mount Tamalpais Marin County, California, U.S. Show map of California Mount Tamalpais Mount Tamalpais (the US) Show map of the US Parent range California Coast Ranges Topo map USGS San Rafael Geology Mountain type Sedimentary Climbing First ascent 1830s by Jacob P. Leese (first recorded ascent) [2] Easiest route Railroad Grade fire trail Mount Tamalpais ( / t æ m əl ˈ p aɪ . ɪ s / ; TAM -əl- PY -iss ; Coast Miwok: /t̪ɑmɑlˈpɑis̺/ , known locally as Mount Tam ) is a peak in Marin County, California, United State...
Read more

FMW Women's Championship

FMW Women's Championship Details Promotion Frontier Martial-Arts Wrestling [1] Date established November 5, 1990 [1] Date retired September 28, 1997 Other name(s) WWA World Women's Championship FMW Independent Women's Championship Statistics First champion(s) Combat Toyoda [1] Most reigns Megumi Kudo (6 reigns) [1] Longest reign Megumi Kudo (426 days) [1] Shortest reign Shark Tsuchiya (<1 day) [1] The FMW Women's Championship (or the FMW Independent Women's & WWA Women's Championship ) was two Japanese women's professional wrestling championships (WWA World Women's Championship and FMW Independent World Women's Championship) contested in the promotion Frontier Martial-Arts Wrestling (FMW). During the heyday of FMW, the female wrestlers wrestled in the same types of bloody death matches as the FMW men, and were feared by other Japanese female wrestlers for their toughness and intensity. ...
Read more