equation of time
Without a margin.
simple past tense and past participle of exhale
The discrepancy between two kinds of solar time: the apparent solar time, which directly tracks the motion of the Sun, and mean solar time, which tracks a theoretical mean Sun with noons 24 hours apart.
mean
A distribution of two or more things at the same time
均時差（見かけの太陽時と平均太陽時のずれ）のため、日時計は時計時刻に比べて最大で約16分ほど進んだり遅れたりすることがある。
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