how to measure apparent size of an object from distance ?

Question

for example sun looking like a football . 10 inch dia

that exact value how to find out

Answer 1

Study trignometry and use the inclined plane and measure the radians and then determine the distance from each other by either using measuring instruments or if you want the distance of a planetary or celestial object - then send a laser towards the object and wait for it to bounce back and measure the time and the distance will be there before you - and then knowing the angle of inclination - you will be able to measure the distance - but taking shortcuts like this one will not get you that 98% in the examns - because there is no one to ask there - so open the book and read the trignometry and coordinate geometry and you will be giving answers all your life instead of asking them - \This is written with a smile - and I hated maths and these 'orrible subject when I was in school my self ..but what to do - one has to learn to live with them ... and be sure you will write and tell me the answer in a day or two yourself
Best of luck

Answer 2

In the course of surveying, they used there a measuring scope and a reference meter stick (at a very far distance) to compute exactly the size and distance of the lot by square meters. This is still an existing engineering practice to date.

For far objects in the solar system, the speed of light is a better tools wherein the sunlight (or a known star) can be used as a reference in the computation.

Answer 3

i'm assuming when you say "from the distance" you mean that you know the actual distance to the object. if you hold your hand out at arms length, for instance, and it takes 2 hands on top of each other to cover up the sun, then you know 3 of the 4 values in a pair of ratios....
2 hands : one arm =
actual diameter : actual distance
or, substituting in some values....
10" : 3' =
x : 93,000,000 miles

convert values to uniform units, write as fractions, cross multiply and solve

Answer 4

There are numerous diverse techniques, counting on how a techniques away the famous person or galaxy is. The farther away it is, the fewer particular the measurements, because of the fact the precision of the concepts for the farther gadgets relies upon on the precision of the concepts for the closer gadgets. we are able to degree the distances to planets using radar ranging - leap a radar beam off a planet, degree the time it takes for the beam to return. in view that radar beams return and forth the fee of sunshine, we are able to then degree the area to the planet. no longer rapidly this additionally provides us the area to our nearest famous person, the sunlight. the closest stars (with the exception of the sunlight) are measured using stellar parallax - as we orbit the sunlight the interior of reach stars seem to shift decrease to and fro relative to farther stars. we are able to degree this shift, and that plus understanding the area to our sunlight can provide us the area to the famous person. This works out to around 3 hundred gentle-years, i think of. nevertheless properly interior of our Galaxy. The concepts for farther stars get somewhat complicated, so i'm going to purely record a number of them and you could seem them up in case you have an interest - additionally seek for "distance ladder" - Stellar parallax (as suggested above) - Spectroscopic parallax (which has no longer something to do with stellar parallax) - Variable stars (Cepheid variables, RR Lyrae stars) - Novae and supernovae, and different common candles - Hubble's regulation there is greater, yet it is all i can think of of off the surprising of my head.

Answer 5

go in the library and read about it. you will not burn nor the book.