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equation of time
(1) The difference in hour angle between mean solar time and apparent solar time. An equivalent definition is the difference between the hour angle of the true Sun and the hour angle of the mean Sun. As the equation of time may be expressed as a correction to either apparent solar time or to mean solar time, its sign must be observed carefully. (2) The difference between mean and apparent time. From the beginning of the year until near the middle of April, mean time is ahead of apparent time, the difference reaching a maximum of about 15 minutes near the middle of February. From the middle of April to the middle of June, mean time is behind apparent time but the difference is less than 5 minutes. From the middle of June to the first part of September, mean time is again ahead of apparent time, with a greatest difference less than 7 minutes. From the first part of September until the latter part of December, mean time is again behind apparent time, the difference reaching a maximum of nearly 17 minutes in the early part of November. The analemma is a graphical display of the equation of time.
- Part of Speech: noun
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- Industry/Domain: Earth science
- Category: Mapping science
- Company: American Congress on Surveying & Mapping
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