Evaluation of the Season-Granting System

[The evaluation consists of eleven sections in two chapters (7 and 8 in this translation). Here is a list of the topics covered, with indications in modern terminology of what each section assesses:

Chapter 7

• 1. Determination of ch’i from observation: solstices

• 2. Year surplus and annual difference: tropical and sidereal year and their relation

• 3. Angular extensions of the lunar lodges: system for recording the equivalent of right ascension

• 4. Tread of the sun: mean solar motion

• 5. Expansion and contraction of the solar motion: apparent motion of the sun

• 6. Slackening and hastening of the lunar motion: apparent motion of the moon

• 7. Crossing cycle of the White Way: nodical month

Chapter 8

• 8. Day and night marks: length of day and night

• 9. Eclipses: accuracy of eclipse predictions at times distant from the epoch

• 10. Corrected conjunctions: apparent conjunctions

• 11. Disuse of Accumulated Years and Day Divisor: adoption of an epoch close to the date of promulgation]