- Aaron's Rod
- Abbadon
- Aberration
- Abscission
- Accidental Ascendant
- Accidental Dignity
- Acronycal
- Acronycal place
- Active Influence
- Adept
- Adjusted Calculation Date
- Adonis
- Advantage, Line of
- Affinity
- Afflicted
- Ages, Astrological
- Agoraphobia
- Air Signs
- Akasa, Akasha
- Albedo
- Alchemist
- Alchemy
- Aleph
- Alfirdar, Alfirdaria
- Almanac
- Almochoden, Alcohoden
- Almuten
- Altitude
- Ambient
- Anahibazon
- Anandrious
- Anareta n., anaretic, a.
- Anaretic Point, Anaretic Place
- Androgyne, n., androgynous, a.
- Angels
- Angle
- Angstrom
- Angular
- Angular Velocity
- Anima Mundi
- Animoder
- Anipathies
- Anomaly
- Antipathy
- Antiscion
- Antisedentia
- Aphelion
- Apheta
- Aphorism
- Apogee
- Apparent Motion
- Application
- Appulse
- Apsis
- Aquarius
- Arabian Points, or Parts
- Arc
- Arc of Vision
- Ares
- Aries
- Armillary Sphere
- Ascendant
- Ascending
- Ascension
- Ascension, Signs of Long
- Ascension, Signs of Short
- Ascensional Difference
- Aspect
- Aspect Patterns
- Aspectarian
- Asterism
- Asteroids
- Astral Body
- Astral Light
- Astral Projection
- Astrodynes
- Astrolabe
- Astrology
- Astromancy
- Astrometeorology
- Astronomical unit
- Astronomos
- Astronomy
- Astrotheology
- Aten
- Athazer
- Aura
- Aurora Borealis, Northern Lights
- Axial rotation
- Axis, Inclination of
- Ayanamsa
- Azimene
- Azimuth
ASTROLABE ENCYCLOPEDIA
