I am beginning of spring in February of Gregorian calendar 1 year, and my birthday is the fourth day of the first month of 87. What should my zodiac be?

You are a tiger, and the attributes of the zodiac are defined by the solar terms in beginning of spring.

1987-2- 1, the fourth day of the first lunar month, the main branch of the sun: Bingyin Ugly Moon. When beginning of spring is on the seventh day of the first month, you were born before beginning of spring, so you are a tiger.

It is wrong for the general public to divide the boundaries with the first day of the first lunar month as the attribute of the zodiac, or even with the New Year's Day of the Gregorian calendar. As long as you remember beginning of spring every year (around February 4th in the Gregorian calendar), you can clearly tell the difference.