Symbols:H/Hour Angle

Hour Angle

$\mathrm {HA}$

Used as an abbreviation and to denote the hour angle.

Let $P$ be a point on the celestial sphere.

The hour angle of $P$ is the angular distance measured westwards along the celestial equator from the vernal equinox.

That is, it is the angular distance measured westwards along the celestial equator between the observer's meridian and the hour circle of $P$.

The $\LaTeX$ code for \(\mathrm {HA}\) is \mathrm {HA} .

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): $\mathrm {HA}$
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): $\mathrm {HA}$