What does Ha mean in Mathematics?

This page is about the meanings of the acronym/abbreviation/shorthand Ha in the Academic & Science field in general and in the Mathematics terminology in particular.

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What does Ha mean?

hour angle, HA(noun)
(astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day

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"Ha." Abbreviations.com. STANDS4 LLC, 2015. Web. 4 Aug. 2015. <http://www.abbreviations.com/term/1424116>.