A research on astronomical and calendric achievements of liao dynasty 辽代天文历算成就浅论
2.
Ancient china made unique contributions to many areas of science including astronomy , calendric system , geography , mathematics , agriculture , medicine and the humanities 古代中国在天文历法、地学、数学、农学、医学和人文科学的许多领域，都作出过独特的贡献。
3.
This paper classifies production style in pre - qin into four stages , according to the main problems and its transformation in production development , which includes : 1 . product stage ; 2 . soil stage ; 3 . climate and calendric stage ; 4 . irrigating agriculture stage 摘要先秦农业生产方式可划分为依次递进的四个阶段，即品种阶段、土壤阶段、气候历法阶段和灌溉农业阶段。
