This not only reflects that progresses were made in calendrical techniques during the period, but also reveals the reciprocal relation between the planetary astrology and the calendar.
验历的内容从汉代使用日月天象扩展到唐宋时代使用五星天象，这不但反映了历法技术上的进步，而且也揭示了五星占与历法的互动关系。
The relation between identification and validation is a reciprocal one.
社会认同和社会确认的关系是互惠的。
The relation between identification and validation is a reciprocal one.
社会认同和社会确认的关系是互惠的。
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