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Division of astronomy & physics
Observational astronomy is a division of astronomy that is concerned with recording data about the observable universe, the practice and study of observing
Observational_astronomy
Italian physicist and astronomer (1564–1642)
of the Duchy of Florence. Galileo has been called the father of observational astronomy, classical physics, the scientific method, and modern science.
Galileo_Galilei
Danish astronomer (1546–1601)
unprecedentedly accurate astronomical observations which helped to turn astronomy into the first modern science and launch the Scientific Revolution. He
Tycho_Brahe
Instrument that makes distant objects appear magnified
the 17th century. They were used for both terrestrial applications and astronomy. The reflecting telescope, which uses mirrors to collect and focus light
Telescope
Scientific study of celestial objects
past, astronomy included disciplines as diverse as astrometry, celestial navigation, observational astronomy, and the making of calendars. Astronomy is one
Astronomy
Subfield of astronomy
when astronomy was limited by astrometry and observational astronomy, the field of celestial mechanics (CM) was referred to as theoretical astronomy. Hipparchus
Astrophysics
American astronomer (1931–2023)
computer, the technology revolutionized the data collection method of observational astronomy, and the technology continued to be widely used for astronomical
Kent_Ford_(astronomer)
Subfield of astronomy that studies celestial objects at radio frequencies
the size of its components. Radio astronomy differs from radar astronomy in that the former is a passive observation (i.e., receiving only) and the latter
Radio_astronomy
Astronomical phenomena viewed from the planet Mars
Earth from Mars Transit of Mercury from Mars Transit of Phobos from Mars Astronomy on Mercury "radiative time constant". pds-atmospheres.nmsu.edu. "The Obliquity
Astronomy_on_Mars
Phenomenon wherein objects appear to move about their true positions in the sky
Light: The Observational Proofs of the Earth's Revolution, Eustachio Manfredi, and the "Bologna Case"". Journal for the History of Astronomy. 40 (2): 155–172
Aberration_(astronomy)
Interstellar absorption and scattering of light
In astronomy, extinction is the absorption and scattering of electromagnetic radiation by dust and gas between an emitting astronomical object and the
Extinction_(astronomy)
Logarithmic measure of the brightness of an astronomical object
In astronomy, magnitude is a measure of the brightness of an object, usually in a defined passband. An imprecise but systematic determination of the magnitude
Magnitude_(astronomy)
Study of the origin of the universe (structure and evolution)
Observational cosmology is the study of the structure, the evolution and the origin of the universe through observation, using instruments such as telescopes
Observational_cosmology
Branch of astronomy using gravitational waves
Gravitational-wave astronomy is a subfield of astronomy concerned with the detection and study of gravitational waves emitted by astrophysical sources
Gravitational-wave_astronomy
Active acquisition of information from a primary source
presence Naturalistic observation Observation unit Observational astronomy Observational error Observational learning Observational study Observable quantity
Observation
Branch of observational astronomy dealing with high-energy cosmic rays
Cosmic ray astronomy is a branch of observational astronomy where scientists attempt to identify and study the potential sources of extremely high-energy
Cosmic_ray_astronomy
Sixth planet from the Sun
2007. Retrieved 6 July 2007. Sachs, A. (2 May 1974). "Babylonian Observational Astronomy". Philosophical Transactions of the Royal Society of London. 276
Saturn
Sky from planet Mercury
Astronomy on Mercury is the sky as viewed from the planet Mercury. Because Mercury only has a thin atmosphere, the sky will be black. Due to the proximity
Astronomy_on_Mercury
Scientist in the field of astronomy
extragalactic astronomy, and physical cosmology. Astronomers can also specialize in certain specialties of observational astronomy, such as infrared astronomy, neutrino
Astronomer
of astronomy is a list of definitions of terms and concepts relevant to astronomy and cosmology, their sub-disciplines, and related fields. Astronomy is
Glossary_of_astronomy
Fifth planet from the Sun
doi:10.1093/pasj/49.1.l1. Sachs, A. (May 2, 1974). "Babylonian Observational Astronomy". Philosophical Transactions of the Royal Society of London. 276
Jupiter
Angle between the light incident on, and reflected from, an astronomical object
In observational astronomy, phase angle is the angle between the light incident onto an observed object and the light reflected from the object. In the
Phase_angle_(astronomy)
Aspect of a heavenly body in which it makes a right angle with the direction of the Sun
In spherical astronomy, quadrature is the configuration of a celestial object in which its elongation is a right angle (90 degrees), i.e., the direction
Quadrature_(astronomy)
Branch of astronomy that uses X-ray observation
X-ray astronomy is an observational branch of astronomy which deals with the study of X-ray observation and detection from astronomical objects. X-radiation
X-ray_astronomy
Branch of astronomy about the celestial sphere
Spherical astronomy, or positional astronomy, is a branch of observational astronomy used to locate astronomical objects on the celestial sphere, as seen
Spherical_astronomy
Observational astronomy performed with gamma rays
Gamma-ray astronomy is a subfield of astronomy where scientists observe and study celestial objects and phenomena in outer space which emit cosmic electromagnetic
Gamma-ray_astronomy
Study of how astronomical objects change with time
Time-domain astronomy is the study of how astronomical objects change with time. Said to have begun with Galileo's Letters on Sunspots, the field has
Time-domain_astronomy
Branch of science about the natural world and its life forms.
periods. There are two types of astronomy: observational astronomy and theoretical astronomy. Observational astronomy is focused on acquiring and analyzing
Natural_science
Two objects on opposite sides of the celestial sphere
In positional astronomy, two astronomical objects are said to be in opposition when they are on opposite sides of the celestial sphere, as observed from
Opposition_(astronomy)
The history of astronomy focuses on the efforts of civilizations to understand the universe beyond earth's atmosphere. Astronomy is one of the oldest
History_of_astronomy
Large, round non-stellar astronomical object
parameter |citeseerx= (help) Sachs, A. (2 May 1974). "Babylonian Observational Astronomy". Philosophical Transactions of the Royal Society. 276 (1257):
Planet
Determination of light intensities of astronomical bodies
In astronomy, photometry, from Greek photo- ("light") and -metry ("measure"), is a technique used in astronomy that is concerned with measuring the flux
Photometry_(astronomy)
Overview of the scientific field of astronomy
observational astronomy are generally made by the specifications of the detectors, specifically the ranges of wavelengths observed: Radio astronomy –
Outline_of_astronomy
Rising of stars prior to sunrise
"Archaic Astronomy and Heliacal Rising". September 10, 2005. Schaefer, Bradley E. (1987). "Heliacal Rise Phenomena". Journal for the History of Astronomy. 18
Heliacal_rising
Study of the universe
dominated by the Big Bang Theory which attempts to bring together observational astronomy and particle physics; more specifically, a standard parameterization
Cosmology
Encompasses a wide variety of astronomical observation via telescopes
Visible-light astronomy has existed as long as people have been looking up at the night sky, although it has improved in its observational capabilities
Visible-light_astronomy
Observation of infrared wavelengths
Infrared astronomy is a sub-discipline of astronomy which specializes in the observation and analysis of astronomical objects using infrared (IR) radiation
Infrared_astronomy
in the Philippines and in Thailand. His particular interest is observational astronomy. He was head of the UK Schmidt Telescope in Australia and of the
Keith_Tritton
Astronomy with terahertz (< 1 mm)-range light
Submillimetre astronomy or submillimeter astronomy (see spelling differences) is the branch of observational astronomy that is conducted at submillimetre
Submillimetre_astronomy
Swiss astronomer (1898–1974)
where he made many important contributions in theoretical and observational astronomy. He was the first to propose supernovas as giant explosions at
Fritz_Zwicky
Iranian-born astronomer
Mobasher is an Iranian-born astronomer. He has been a Professor of Observational Astronomy at the University of California, Riverside since July 2007. Mobasher
Bahram_Mobasher
Swedish astronomer (1921–2008)
1921 - June 4, 2008) was a Swedish astronomer who specialised in observational astronomy. He received his PhD from Uppsala University in 1954. In 1957 he
Bengt_Westerlund
Astronomy on the Indian subcontinent
belonged to the Kerala school of astronomy and mathematics. Parameshvara was a proponent of observational astronomy in medieval India and he himself had
Indian_astronomy
Light from the stars
planetshine, and zodiacal light. Observation and measurement of starlight through telescopes is the basis for many fields of astronomy, including photometry and
Starlight
Pair of stars that appear close to each other
In observational astronomy, a double star or visual double is a pair of stars that appear close to each other as viewed from Earth, especially with the
Double_star
Variation in brightness and the position of stars due to atmospheric refraction
free dictionary. Adaptive optics Interplanetary scintillation Observational astronomy Twinkle, Twinkle, Little Star Twelve Variations on "Ah vous dirai-je
Twinkling
Methods and instruments used to observe the Moon
Station) transit. Solar System portal List of lunar craters Moon Observational astronomy Planetshine "Why Does the Moon Look Larger at the Horizon? We Asked
Lunar_observation
American astronomer and cosmologist
Chair of Observational Astronomy in the Department of Physics & Astronomy at Texas A&M University where he is director of the Astronomy Program. He
Nicholas_B._Suntzeff
(astrophysics) (atomic physics) (foundational quantum physics) (observational astronomy) (quantum electrodynamics) (X-rays) Contrast effect (cognition)
List_of_effects
Overview of and topical guide to space science
subdisciplines of observational astronomy are generally made by the specifications of the detectors: Radio astronomy – >300 μm Submillimetre astronomy – 200 μm
Outline_of_space_science
Amount of air seen through in astronomical observations
In astronomy, air mass or airmass is a measure of the amount of air along the line of sight when observing a star or other celestial source from below
Air_mass_(astronomy)
Short-lived light, color, or change in appearance on the surface of the Moon
common targets when viewing the Moon, and this correlation could be an observational bias. In support of the outgassing hypothesis, data from the Lunar Prospector
Transient_lunar_phenomenon
Appearance of the sky in a clear night
study of objects in the night sky takes place in the context of observational astronomy. Visibility of celestial objects in the night sky is affected by
Night_sky
Unobstructed view upward from Earth
ground and outer space, thus distinct from outer space. In the field of astronomy, the sky is also called the celestial sphere. This is an abstract sphere
Sky
General map or image of a region of the sky with no specific observational target
of a region of the sky (or of the whole sky) that lacks a specific observational target. Alternatively, an astronomical survey may comprise a set of
Astronomical_survey
Unexplained gamma rays from the Galactic Center
Milky Way galaxy Gamma-ray astronomy – Observational astronomy performed with gamma rays List of unsolved problems in astronomy Goodenough, Lisa; Hooper
Galactic_Center_GeV_excess
Trace radiation from the early universe
then-current scientific consensus Observational cosmology – Study of the origin of the universe (structure and evolution) Observation history of galaxies – System
Cosmic_microwave_background
Apparent anisotropy in the expansion of the universe
The Rubin–Ford effect is, per Ian Ridpath's Dictionary of Astronomy, an apparent rather than actual "anisotropy in the expansion of the Universe on a
Rubin–Ford_effect
Irish astronomer and Jesuit priest
astronomer and Jesuit priest who is particularly known for his work in observational astronomy. He worked primarily observing binary star systems, and was involved
Daniel_Joseph_Kelly_O'Connell
Description of an astronomical object's brightness as a function of phase angle
In astronomy, a phase curve describes the brightness of a reflecting body as a function of its phase angle (the arc subtended by the observer and the
Phase_curve_(astronomy)
1992-99 astronomical observational search
In astronomy, the MACHO Project was an observational search during 1992-1999 for dark matter around our Milky Way galaxy in the form of hypothetical MAssive
MACHO_Project
Study of astronomical objects that release highly energetic electromagnetic radiation
wavelengths. It includes X-ray astronomy, gamma-ray astronomy, extreme UV astronomy, neutrino astronomy, and studies of cosmic rays. Astronomical objects
High-energy_astrophysics
Imaging of astronomical objects
Since almost all observational astronomy today uses photography, the term "astrophotography" usually refers to its use in amateur astronomy, seeking aesthetically
Astrophotography
Large self-illuminated object in space
Antonio (15 May 2019). "What is a globular cluster? An observational perspective". The Astronomy and Astrophysics Review. 27 (1): 8. arXiv:1911.02835.
Star
Coordination of related astronomical observations
Multi-messenger astronomy is the coordinated observation and interpretation of multiple signals received from the same astronomical event. Many types of
Multi-messenger_astronomy
Brightness of a celestial object observed from the Earth
property of a star regardless of how close it is to Earth. But in observational astronomy and popular stargazing, references to "magnitude" are understood
Apparent_magnitude
Scientific field of study
between 1609 and 1619), Galileo's pioneering work on telescopes and observational astronomy in the 16th and 17th centuries, and Isaac Newton's discovery and
Physics
Technique for viewing faint objects with peripheral vision
1207/s15327876mp1003_2. Azevedo, FS; Mann, MJ (2016). Embodied Cognition in Observational Amateur Astronomy. International Conference of the Learning Sciences. International
Averted_vision
Observing nearby astronomical objects by analyzing reflected microwaves
analyzing their reflections. Radar astronomy differs from radio astronomy in that the latter is a passive observation (i.e., receiving only) and the former
Radar_astronomy
Optical classification
ISBN 978-0-444-85444-5, retrieved 2026-04-01 Birney S, Gonzalez G, Oesper D "observational astronomy" second edition, Cambridge university press, 2006 v t e
Isoplanatic_patch
Calibration factor in a photometric system
In astronomy, the zero point in a photometric system is defined as the magnitude of an object that produces 1 count per second on the detector. The zero
Zero_point_(photometry)
Time between earliest and latest observations of a Solar System body
In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations
Observation_arc
Human vision, unaided by optical instruments
instrument, such as a telescope or microscope, or eye protection. In astronomy, the naked eye may be used to observe celestial events and objects visible
Naked_eye
develops instruments resembling and perhaps inspiring the torquetum, an observational instrument and mechanical analog computer device 1119–25 – Cairo al-Bataihi
Timeline of telescopes, observatories, and observing technology
Timeline_of_telescopes,_observatories,_and_observing_technology
Electromagnetic radiation from the Big Bang
cosmic voids detected in the WISE-Pan-STARRS luminous red galaxy catalog". Astronomy & Astrophysics. 689: A171. arXiv:2312.08483. Bibcode:2024A&A...689A.171C
Cosmic_background_radiation
Optical effect of interplanetary dust reflections
Retrieved 15 September 2021. Moore, Patrick (2000). The Data Book of Astronomy. CRC Press. p. 490. ISBN 1-4200-3344-1. Ley, Willy (April 1961). "The
Gegenschein
Optical effect
astronomical opposition. Two physical mechanisms have been proposed for this observational phenomenon: shadow hiding and coherent backscatter. The phase angle
Opposition_surge
Comparison of a wide range of timescales
are most commonly seen only in a few scientific contexts such as observational astronomy and materials science, although this depends on the author. For
Orders_of_magnitude_(time)
Science of planets and planetary systems
astrobiology. There are interrelated observational and theoretical branches of planetary science. Observational research can involve combinations of space
Planetary_science
Wilhelm Röntgen's discovery had no effect on observational astronomy for the first 50 years. X-ray astronomy became possible only with the capability to
History_of_X-ray_astronomy
Measurement of electromagnetic radiation for astronomy
Astronomical spectroscopy is the study of astronomy using the techniques of spectroscopy to measure the spectrum of electromagnetic radiation, including
Astronomical_spectroscopy
Scientific study of celestial objects visible in wavelengths of 30-450 μm
Far-infrared astronomy is the branch of astronomy and astrophysics that deals with objects visible in far-infrared radiation (extending from 30 μm towards
Far-infrared_astronomy
When an object is hidden behind another
by another object that passes between them. The term is often used in astronomy, but can also refer to any situation in which an object in the foreground
Occultation
Meteoroid that enters Earth's atmosphere and leaves again
(2 March 2009). "Earthgrazer: The Great Daylight Fireball of 1972". Astronomy Picture of the Day. NASA. Retrieved 2013-10-19. "Images of Harper's Weekly
Earth-grazing_fireball
Area of the sky with minimal amounts of neutral hydrogen
distant objects, which makes it an attractive area of the sky for observational astronomy surveys. It is located near the pointer stars of the Big Dipper
Lockman_Hole
Mexican astronomer
institutions, Haro was influential in the development of modern observational astronomy in Mexico. Internationally, he is best known for his contribution
Guillermo_Haro
Shape of the Moon's sunlit portion as viewed from Earth
Survey of Ancient and Cultural Astronomy (2nd ed.). Springer. ISBN 978-1-4419-7624-6. Kutner, Marc L. (2003). Astronomy: A Physical Perspective. Cambridge
Lunar_phase
Observation of distant objects on Earth's surface or terrestrial features
always far away from the observer. They are usually the subject of observational astronomy and astrophotography. Concerning the position of an observer and
Long_distance_observations
Any astronomical object that is not an individual star
classification for these objects, has its origins in the modern field of amateur astronomy. The origin of the term is unknown but it was popularized by Sky & Telescope
Deep-sky_object
Atmospheric distortions of light
Frederick R. (2010). To measure the sky : an introduction to observational astronomy (1. publ. ed.). Cambridge: Cambridge University Press. p. 140.
Astronomical_seeing
American astronomer and academic
Laboratory for Multiwavelength Astrophysics. Her research considers observational astronomy and galaxy evolution. She is a lead investigator on the Cosmic
Jeyhan_Kartaltepe
Bias in a statistical analysis due to non-random selection
relation to the study topic and other reasons. Malmquist bias in observational astronomy is a bias caused by the limit of the detector sensitivity. Because
Selection_bias
Astronomy competition
SEDS NASA Astronomy Picture of the Day: Iran Messier Marathon (19 April 2008) Messier Objects Ranked By Observing Difficulty Portals: Astronomy Stars Outer
Messier_marathon
Telescope for observations with visible light
(including monoculars and binoculars) for outdoor activities such as observational astronomy, ornithology, pilotage, hunting and reconnaissance, as well as
Optical_telescope
Astronomical survey
States, the United Kingdom, Germany, and Australia. Extragalactic astronomy Observational cosmology Andromeda XXI Andromeda XXII "PandAS". www.cfht.hawaii
Pan-Andromeda Archaeological Survey
Pan-Andromeda_Archaeological_Survey
Type of frequency comb
An astro-comb is a type of frequency comb used in observational astronomy to increase the accuracy of wavelength calibration in spectrographs. The increased
Astro-comb
British astronomer
CCD imaging shortly before 1991. His interest in this kind of observational astronomy rose in 1991, after he met Ian King, another amateur astronomer
Nik_Szymanek
Period of time
as in automated processing of financial transactions and time-domain astronomy. Real-time computing systems can guarantee responses on the order of milliseconds
Window_of_opportunity
American astronomer
2004 recipient of the Herschel Medal, which he received for his observational astronomy work on cataclysmic variable stars. "Keith Douglas Horne". University
Keith_Horne_(astronomer)
Hobby of watching the sky and stars
amateurs as an observing list. Observation Observational astronomy School Astronomical Olympiad by Correspondence Sidewalk astronomy Star party "American Association
Amateur_astronomy
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OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
Boy/Male
Hindu, Indian, Sanskrit, Tamil, Telugu
Name of a Celestial Star; The Second Nakshatra in Hindu Astronomy; God of Good Luck
Boy/Male
Hindu, Indian, Telugu
Observation; Progressive; Lord Ganesh
Girl/Female
Australian, British, Christian, English, French, German, Greek, Italian, Portuguese
Heavenly; Muse of Astronomy
Girl/Female
Arabic
Bird; High-flying; In Astronomy Altair is a Star of the First Magnitude
Female
Greek
(ΟυÏανία) Greek myth name of a muse of astronomy, derived from the word ouranios, OURANIA means "heavenly."
Boy/Male
Indian
Correctly Observation
Boy/Male
Arabic, Australian, French, Indonesian
Slave; Observation
Male
English
From Latin geminus GEMINI means "twin." In Astrology, it is a zodiac sign. In Astronomy, it is the name of a constellation. In Roman mythology, Castor and Pollux are the Gemini twins, the sons of Leda, brothers to Helen of Troy and Clytemnestra. In Greek they are called the Dioskouroi.
Female
Hebrew
(×ַלְיָה) Aramaic and Hebrew name ALYA means "dirge, elegy" or "sheep's tail." In astronomy, this is the traditional name for Theta Serpentis, a star in the constellation Serpens.Â
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
OBSERVATIONAL ASTRONOMY
n.
The act or the faculty of observing or taking notice; the act of seeing, or of fixing the mind upon, anything.
p. p. & a.
Taught by practice or by repeated observations; skillful or wise by means of trials, use, or observation; as, an experienced physician, workman, soldier; an experienced eye.
v. t.
To assign a weight to; to express by a number the probable accuracy of, as an observation. See Weight of observations, under Weight.
n.
The act of recognizing and noting some fact or occurrence in nature, as an aurora, a corona, or the structure of an animal.
n.
Preface; introduction; preliminary observations; prelude.
n.
The result of an act, or of acts, of observing; view; reflection; conclusion; judgment.
n.
Hence: An expression of an opinion or judgment upon what one has observed; a remark.
n.
Performance of what is prescribed; adherence in practice; observance.
n.
State of being under observation.
a.
Of a pertaining to observation; consisting of, or containing, observations.
n.
Observation of difference; distinction.
n.
Observation; notice; heed.
n.
The information so acquired.
n.
Specifically, the act of measuring, with suitable instruments, some magnitude, as the time of an occultation, with a clock; the right ascension of a star, with a transit instrument and clock; the sun's altitude, or the distance of the moon from a star, with a sextant; the temperature, with a thermometer, etc.
n.
Sphere or scope of observation.
n.
Observation of the stars.
a.
Tending to conserve; preservative.
n.
Erroneous observation.
n.
Advisement; observation; deliberation.
n.
Neglect or want of observation.
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