Will the personality of the next zodiac sign be similar if their birthdays are just one day apart?

If the birthday is at the junction of the zodiac signs. You can find out which constellation you belong to by checking the "Constellation Edge Cheat Sheet".

See the proportion of your own zodiac sign by checking the degree of the sun sign on the astrolabe. The house occupied by each sun sign is 360/12=30. 30 degrees is divided into 3 levels, and each level occupies 10 degrees. Also called the ten-degree interval. The planets in the first ten-degree interval have the strongest power, which can best bring out the characteristics of the constellation. However, the power of the second and third ten-degree intervals is weak, and the typical characteristics of the constellation are less able to be displayed and will be hidden. The character of a certain constellation with the same elements (earth, fire, fengshui) as the constellation.