Distance from sun to star


by z.js
Tags: distance, star
z.js
z.js is offline
#1
Aug29-13, 03:36 AM
z.js's Avatar
P: 46
Is it possible to calculate the distance from the sun to a star like this? (what I mean is can the angles from the diagram actually be calculated?)

From the diagram:
γ = ∏ - α - ∂
= ∏ - (α + ∂)
D / sin(γ) = d / sin(∂)
sin(γ) = sin(∏ - (α + ∂))
= sin(α + ∂)
D / sin(α + ∂) = d / sin(∂)

D = (sin(α + ∂) / sin(∂)) * d
Attached Thumbnails
star.jpg  
Phys.Org News Partner Earth sciences news on Phys.org
phyzguy
phyzguy is online now
#2
Aug29-13, 06:35 AM
P: 2,080
Look up parallax measurement. This is essentially what we do to measure the distance to the nearest stars. The difference is that, since we can't make measurements from the sun (to measure the angle you've marked alpha), we measure the direction of the star from two different sides of the Earth's orbit, for example, measuring in June and then again in December. The small difference in these two angles, when combined with the diameter of the Earth's orbit, allows us to measure the distance to the star.
z.js
z.js is offline
#3
Sep1-13, 05:51 AM
z.js's Avatar
P: 46
Thanks. :)


Register to reply

Related Discussions
Does twinklingdepends on the star or the distance? Astrophysics 12
Distance of Star Cluster Introductory Physics Homework 0
Star Distance Relativity Cosmology 5
Distance to star, much little Astrophysics 5
Big Bang+Distance of a New Star General Astronomy 3