How many stars r in the sky?

Answer 1

Short answer: All of them are.

More details:

-- On the average, the faintest stars detectable by human eyes, in dark skies

during conditions of good 'seeing', are those of the 6th magnitude.

-- Roughly 5,000 stars exist with apparent visual magnitude at or below (brighter than) 6th magnitude.

-- Depending on your location on Earth, the fraction of all stars visible to you at some time

during the year varies from 50% (at the poles) to 100% (on the equator).

-- At any moment during the night, the fraction of stars visible to you at any time

that are visible to you at that moment varies from 50% (at the equator) to 100%

(at the poles).

-- Averaging all the variables into a single number that may be equally inaccurate

anywhere on Earth, you can assume that any time you're outside on a clear night,

far from city lights and other sources of artificial illumination, during conditions of

'good seeing', there are roughly 2,000 to 2,500 stars in the sky that are visible to

your unaided eyes.