Arriving at the end of each year (that is, the last day of the lunar calendar) wasn't just a new day taking over from the previous one, but also a new year taking over from the previous one, and this was called 'first exchange'.

Source: Tatoeba

That Space, as our mathematicians have it, is spoken of as having three dimensions, which one may call Length, Breadth, and Thickness, and is always definable by reference to three planes, each at right angles to the others.

Source: Tatoeba

If we knew what we were doing, it wouldn't be called research, would it?

Source: Tatoeba