how can i measure parellex angle of any planet or star?

Answer 1

Planetary parallax can only be measured over the baseline of the Earth's diameter. The orbital baseline is useless because the planets' motion is much greater than their parallax. The upcoming transit of Venus in 2012 gives you an opportunity to recreate the planetary parallax experiments that helped define the distance scale in the solar system. You'll need to find partners at other latitudes to compare results with.

Direct stellar parallax is pretty much out of reach for an amateur astronomer. However, you might be able to do it using positions determined from more distant background stars. The largest parallaxes are less than the airy disk diameter in most amateur scopes, so you'll probably need to average multiple measurements. The traditional tool for this sort of measurement is the filar micrometer, but these days a CCD camera is more likely the instrument of choice. You'll need multiple time points to separate the star's proper motion from its parallax.

Check out "Measuring the Distance to Teegarden's Star" in the February 2006 Sky &Telescope for an example of how it can be done.

Executive summary: this is a project for an advanced amateur astronomer with a serious astrophotography setup.

Answer 2

For planet, measure position relative to background stars. Wait 6 months and measure again. Correcting for all the other stuff, you can get parallax!

Not possible with stars

Answer 3

i think you mean "parallax" , if u do then u can use the formula diameter = distance X the angle

Answer 4

Try the website below, it might help you.