how will you know that sun is in your sign?

Answer 1

Basically, one can look at an ephemeris that shows the positions of all the planets for a given period. The year is of an uneven length, not quite 365.25 days, so the time the planets enter each zodiac sign varies from year to year.

Answer 2

You can base your idea on :
a) the constellations
b) the solstice, the equinox and the seasons
c) info given by astrologers

Solution A is not accurate, bc the image given by the constellations is many light years away from the earth.

Solution B is accurate, because the solstice and the equinox are consequences of the sun's position relative to the earth's poles.

Solution C looks accurate, because it follows the pattern of the seasons.

That being said, we may want to know how many signs are really in the zodiac. Traditionally we have 12 signs, but did our solar system change since the first standards were set? The planets, if we include any ball of our system that's bigger than Pluto, cumulate beyond 12.

Answer 3

Sun is a star, not a planet. So I don't think sun would be in your sign at all.