GC Astronomy Total Number of Naked Eye Stars in A Location Questions

In this assignment you will estimate the number of naked-eye stars in the sky.  You will sample the sky in many different directions, by looking through a tube of some kind.  A cardboard tube from a paper towel roll would work fine.  You will then use your results in a formula that will estimate the total number of naked-eye stars in the sky at your location.

Place your tube against your eye socket without poking your eye out, and aim the tube at the sky.  You don’t want to bias your sample by only pointing at bright, starry places in the sky, so point WITH YOUR EYES CLOSED.  Open your eyes and  count the number of stars you can see through the tube, and write it down.  It might only be one star, or even zero.  Don’t move the tube while you are counting; we don’t want any new stars coming into view.  Aim the tube at a new location in the sky and count the stars.  Take ten samples of stars in this way.  Try to get samples from all over the sky: high, low, north, east, south, west, etc.

Calculate the average number of stars in your sample by adding all the sample numbers together and dividing by ten.

Measure the dimensions of your tube: length and diameter.  Measure your dimensions in millimeters; that’s the easiest way.

The number of naked-eye stars in the sky can be estimated with this formula: 

Number of stars in sky = (8 x L2 / D2) x average number stars per sample,

Where L is the length of your tube in mm, and D is the diameter of your tube in mm.