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Definition of parsec, is this right?

If the exam asked me, what is the definition of parsec? (2 marks)

Do you honestly think this answer (below) will reap full marks? And is the definition 100% correct?
One parsec is the distance at which the mean radius of the Earth's orbit subtends an angle of one arc second.

Reply 1

Ktulu666

It should get full marks but personally I would avoid using "Earth's orbit" without clarification. Use Astronomical Unit instead :smile:

Reply 2

Sayonara

All right, thanks. The definition below should be the best answer I hope as I've simplified it as much as possible but I hope it would not lose marks.

One parsec is the distance at which one AU would subtend an arc second.