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Janvi Gupta from M D N SR. SECONDARY SCHOOL , asked a question
Subject: Physics , asked on 11/5/15

 What is PARALLACTIC SECOND?

EXPERT ANSWER

Ankur Deep ,Meritnation Expert added an answer
Answered on 11/5/15

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Ashish , From Maharaja Agrasan Vidyalaya , added an answer
Answered on 3/5/10

 Difference in the direction of a celestial object as seen by observers from two widely separated points, a measurement used to find a body 's distance. The two positions of the observers and that of the object form a triangle; its apex angle (at the object) is twice the parallax, which becomes smaller with increasing distance. Observations for calculating the Sun 's parallax can be made simultaneously from two different places on Earth 's surface; that value reaches a maximum of 8.794 seconds of arc for observers at points separated by Earth 's diameter. Observing the difference in an object 's position as seen from Earth at points six months apart in its orbit (stellar, or annual, parallax) allows measurements of distances (e.g., of stars) too large to be made from two places on Earth 's surface. The nearest star system, Alpha Centauri, has a stellar parallax of 0.76 second of arc. Highly precise parallaxes, and thus the positions, of more than 100,000 stars in the Sun 's vicinity were determined from data collected by the European Space Agency 's Hipparcos satellite (launched 1989).

Nitin Gupta , From Birla Senior Secondary School,pilani , added an answer
Answered on 3/5/10

 What do you mean by -- ' x ' seconds of arc where x refers to any value?

And I didn 't asked what is parallax I asked What is PARALLACTIC SECOND?

mbruth15... , added an answer
Answered on 8/4/11

what is parallictic angle?

www.faraz0594... , added an answer
Answered on 12/4/11

 angle made by an arc of one second at a point on earth or observation point....is called an parsec...ok...

Ghulam Ullah , added an answer
Answered on 3/6/12

what is parallactic second

Ghulam Ullah , added an answer
Answered on 3/6/12

S.I unit of form factor

Ghulam Ullah , added an answer
Answered on 3/6/12

what is S.I unit of form factor

Janvi Gupta , From M D N Sr. Secondary School , added an answer
Answered on 11/5/15
1 parallatic second is the radius of a circle at the centre of circle,1AU long,subtends on angle1''