DICTIONARY OF

Azimuthal Projection 29 Azores Anticyclone
Azimuthal Projection. Alternative name for 'Zenithal' projection.
Altitude Azimuth Instrument. 'Alt-Azimuth Instrument.'
Azimuth Circle. Instrument similar to 'Azimuth Mirror', but is not pivoted at centre; an
outer ring, encircling bowl, keeping it centred.
Azimuth Compass. Compass fitted to carry an instrument for taking azimuths at any
altitude. Placed so that there is a minimum of obstructions to observations.
Azimuth Diagram. Engraved diagram by which azimuth can be graphically obtained by
using declination, latitude and apparent time. Devised by Captain Weir, R.N.
Azimuth Mirror. Instrument for obtaining azimuth of observed objects by observing
object's reflection in a mirror, or prism, pivoted in centre of glass over compass card.
Preceded azimuth circle. Invented by Lord Kelvin.
Azimuth of Heavenly Body. Intercepted arc of horizon between meridian and vertical circle
passing through body. Generally reckoned from elevated pole through 180° East or West.
Azimuth Prism. Alternative name for 'Azimuth Circle' or 'Azimuth Mirror'.
Azimuth Tables. Precomputed quantities that give azimuth corresponding to a given time, a
given latitude and a known declination.
Azores Anticyclone. Atlantic part of a more or less permanent zone of anticyclonic weather
that girdles Earth in 30° N approximately.