Misc: what sign of the zodiac is represented by a centaur??

Questions

In 1948 ---------- (now Sri Lanka) gains independence from Britain.?

In 1973 The ---------- - Israel's missile boat - is unveiled.?

In 1980 Abolhassan ---------- was installed as president of Iran.?

In 1825 Hannah Lord ---------- of New York grabs her scissors and creates the first detachable collar on one of her husband's shirts, in order to reduce her laundry load.?

In 1837 Dwight Lyman---------- , evangelist, born.?