IOAA 2021 Exam Date

IOAA 2021 Date

The key aim of the IOAA is to promote an increased interest in astronomy and related subjects, especially among young people, and to improve the development of international contacts between countries in promoting astronomy and astrophysics in schools. More bright high school students are predicted to be interested in studying astronomy at the university level as the next generation of astronomers as a result of events like IOAA.

Stages of IOAA Exam

The astronomy Olympiad programme is divided into five stages:

Stage I: National Standard Examination in Astronomy (NSEA),

Stage II: Indian National Astronomy Olympiad (INAO),

Stage III: Orientation cum Selection Camp (OCSC) in astronomy,

Stage IV: Pre-departure Training Camp (PDT) for IOAA,

Stage V: International Olympiad in Astronomy and Astrophysics (IOAA).

Stage I: National Standard Examination in Astronomy (NSEA)




To be notified

Name enrollment

To be notified

Last Payment date

To be notified

Exam date

To be notified

Result date

To be notified

Display of final list of candidates

To be notified

Stage II: Indian National Astronomy Olympiad (INAO)



Last date of registration

2nd week of Jan 

Commencement of INAO

1st week of Feb 

Release of answer keys

Within a few days

Last date to receive feedback on answers

2nd week of Feb


3rd week of Feb

Last date of Re-evaluation

4th week of Feb

Final scores/ OCSC list publication

1st week of March

Stage III: Orientation Cum Selection Camp (OCSC) in Astronomy




2nd week of April


22nd April- 9th May

Junior Science

2nd May- 17th May


29th May- 8th June


29th May- 8th June


29th May- 8th June

FAQs (Frequently Asked Questions)

1. What are Topics Covered under Basic Astrophysics?

Ans. Celestial Mechanics- Newton’s Laws Of Gravitation, Kepler’s Laws For Circular And Non-circular Orbits, Roche Limit, Barycentre, 2-body Problem, Lagrange Points.

Electromagnetic Theory & Quantum Physics- Electromagnetic Spectrum, Radiation Laws, Blackbody Radiation.

Thermodynamics-Thermodynamic Equilibrium, Ideal Gas, Energy Transfer.

Spectroscopy and Atomic Physics- Absorption, Emission, Scattering, Spectra Of Celestial Objects, Doppler Effect, Line Formations, Continuum Spectra, Splitting And Broadening Of Spectral Lines, Polarisation.

Nuclear Physics- Basic Concepts Including Structure Of An Atom, Mass Defect And Binding Energy Radioactivity, Neutrinos (Q).

2. What are Topics Covered under Coordinates and Times?

Ans. Celestial Sphere- Spherical Trigonometry, Celestial Coordinates And Their Applications, Equinox And Solstice, Circumpolar Stars, Constellations And Zodiac.

Concept of Time- Solar Time, Sidereal Time, Julian Date, Heliocentric Julian Date, Time Zone, Universal Time, Local Mean Time, Different Definitions Of “Year”, Equation Of Time.

3. What are Topics Covered under the Solar System?

Ans. The Sun- Solar Structure, Solar Surface Activities, Solar Rotation, Solar Radiation And Solar Constant, Solar Neutrinos (Q), Sun-earth Relations, Role Of Magnetic Fields (Q), Solar Wind And Radiation Pressure, Heliosphere (Q), Magnetosphere (Q).

The Solar System- Earth-moon System, Precession, Nutation, Libration, Formation And Evolution Of The Solar System (Q), Structure And Components Of The Solar System (Q), Structure And Orbits Of The Solar System Objects, Sidereal And Synodic Periods, Retrograde Motion, Outer Reaches Of The Solar System (Q).

Space Exploration- Satellite Trajectories And Transfers, Human Exploration Of The Solar System (Q), Planetary Missions (Q), Sling-shot Effect Of Gravity, Space-based Instruments (Q).

Phenomena-Tides, Seasons, Eclipses, Aurorae (Q), Meteor Showers.

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