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A'Hearn, Michael

A-type main-sequence star

Aaronson, Marc

Abastumani Astrophysical Observatory

Abbe, Ernst

Abbot, Charles Greeley

Abbott, Francis

Abel, Tom

Abell, George O.

Abell catalogue

Abell Clusters

Aberration

Abetti, Antonio

Abetti, Giorgio

Absolute Zero

Absorption Spectrum

Abul Wafa Mohammad al-Buzjani

Accretion (astrophysics)

Acceleration

Accretion

Accretion disk

Ace (Advanced Composition Explorer)

Achernar

Achilles 588

Achondrite

Acousto-Optic Spectrographs

Active galactic nucleus

Active Galaxy

Active Optics

Active Region

Adams, John Couch

Adams, Walter Sydney

Adaptive Optics

Adelard of Bath

Adelman, Saul

Adrastea

Aegaeon

Aegir

Aepinus, Franz Ulrich Theodosius

Aerolite

Aglaonike

Agrippa (crater)

Air Force Maui Optical Station

Airglow

Airy Disk

Airy, George Biddell

Aitken, Robert Grant

Aitne

Akebono (EXOS-D)

Akyüz Mattei, Janet

al-Battani, Abu Abdulla (Albategnius)

Albedo

Albiorix

Albireo

al-Biruni, Abu Raihan

Albumazar (Abu Mashar al-Balkhi)

Aldebaran

Alden, Harold

Aldrin, Edwin Eugene, Jr

ALEXIS (Array of Low Energy X-ray Imaging Sensors)

al-Farghani, Abu’l-Abbas Ahmad ibn Muhammad ibn Kathir

Aldering, Gregory Scott

Aldrich, Loyal Blaine

Alfonso X

Alfven, Hannes Olof Gosta

Algol

Algol variable

Algonquin Radio Observatory

al-Khwarizmi

Allegheny Observatory

Allen, Clabon

Allen, David

Allen, Leah

Allende Meteorite

Aller, Lawrence H.

Almanac

Alpha Andromedae

Alpha² Canum Venaticorum variable

Alpha Particle

Alpher, Ralph Asher

al-Quhi, Abu Sahl Wayjan ibn Rustam

al-Sufi, Abu al-Rahman

Altazimuth Mount

Altitude

Alu, Jeff T.

Alvarez, Luis Walter

al-Zarqali

AM Herculis

Am star

Amalthea

Amateur astronomy

Ambartsumian , Viktor Amazaspovich

Amburgey, Leonard L.

American Association of Variable Star Observers

American Astronomical Society (AAS)

Ames, Adelaide

Amici, Giovanni Battista

Ananke

Ananke Group

Anaxagoras of Clazomenae

Anaximander of Miletus

Anaximenes of Miletus

Ancient Greeks on the Moon

Anderson, Carl David

Andromeda, Constellation

Andromeda Galaxy

Anglo-Australian Observatory

Angstrom

Angular Momentum

Annual Review of Astronomy and Astrophysics

Anomalous cosmic ray

Anomalous X-ray pulsar

Antapex

Antares

Antennae Galaxies

Anthelme, Voituret

Anthropic principle

Antimatter

Antlia, Constellation

Antoniadi, Eugenios

Antoniadi ( crater)

Ap and Bp stars

Apache Point Observatory

Apastron

Aperture

Aperture Synthesis

Apex

Apfel, Necia H.

Aphelion

Aphrodite Terra

Apian, Peter

Apoapsis

Apogee

Apollonius of Perga

Apollonius (crater)

Apparent Solar Time

Apparition

Appleton, Edward Victor

Appulse

Apus, Constellation

Aquarius, Constellation

Aquila, Constellation

Ara, Constellation

Arago, Dominique Francois Jean

Aratus

Aratus (crater)

Arcetri Astrophysical Observatory

Archelaus

Archimedes of Syracuse

Arcturus

Arecibo Observatory

Argelander, Friedrich Wilhelm August

Argo Navis

Ariel (moon)

Aries, Constellation

Aristarchus of Samos

Aristillus

Aristotle of Stagira

Armagh Observatory

Armillary Sphere

Armstrong, Neil Alden

Arons, Jonathan

Arp, Halton

Arrhenius, Svante August

Artificial Satellite

ASCA (Advanced Satellite for Cosmology and Astrophysics/Astro-D)

Ashen light

Association of Universities for Research in Astronomy

Asterism

Asteroid

Asteroid Belt

Astigmatism

Astrid

Astro Space Center (Russia)

Astrochemistry

Astrodynamics

Astrolabe

Astrometry

Astronomical Institute of Athens

Astronomical Society of Australia

Astronomical Society of the Pacific

Astronomical spectroscopy

Astronomical unit

Astronomische Gesellschaft

Astronomische Gesellschaft Katalog

Astronomische Nederlands Satelliet (ANS)

Astronomy

Astrophysical Bounds on Particle Properties

Astrophysical plasma

Astrophysical X-ray source

Astrophysics

Astrophysics Data System

Astrophysics and Space Science

Asymptotic giant branch

Atlas

Atlas (crater)

Atmosphere of Jupiter

Atmosphere of Uranus

Auriga, Constellation

Australian Astronomical Observatory

Auzout, Adrien

Mathematics Encyclopedia

Physics Encyclopedia

World

Index

Hellenica World - Scientific Library