1990.4. 18 What constellation is converted into solar calendar?

1990 Lunar April 18 Gregorian calendar date is May 12, and the constellation of that day is Taurus.

On April 18th of the lunar calendar, Geng Wu.

Four Pillars: Geng Wuxin's Four Dingchou

Gregorian calendar:1May, 99012nd Saturday Taurus

Source: Hua.com.