The distance from which 1 AU subtends an angle of 1 microarcsecond.
That's a lot easier than your other questions!
A Megaparsec is:
- The distance to the Andromeda galaxy
- The distance from which 1 AU subtends an angle of 1 microarcsecond
- The distance from which 1 AU subtends an angle of 1 arcsecond
- The size of the observable universe
2 answers
1. Distance in parsecs (d)= 1/(parallax angle in arcseconds
2. 1 arsec = 1/60(arcminute) =4.8481368 µrad
3. 1 parsec = 206264.806 au
4. d = 1/206264.806 = 4.8481368 µrad = 1 arsec
5. d = 1/Megaparsec = 1 micro arsec
2. 1 arsec = 1/60(arcminute) =4.8481368 µrad
3. 1 parsec = 206264.806 au
4. d = 1/206264.806 = 4.8481368 µrad = 1 arsec
5. d = 1/Megaparsec = 1 micro arsec
1 answer