In Celsius was 0 always the freezing point of water?

Answer 1

The Celsius temperature scale was changed to its current status shortly after the death of Anders Celsius, who devised the system. Until then, 0 degrees was the boiling point of water and 100 degrees was the freezing point.

(see: http://www.answers.com/topic/celsius)

Answer 2

No, 0 degrees Celsius was not always considered the freezing point of water. The Celsius scale was defined in 1742 with 0°C set as the boiling point of water and 100°C as the freezing point. In 1743, this was reversed to the scale we use today with 0°C as the freezing point and 100°C as the boiling point of water.