"The first hour is before the second hour."
Translation:Prima hora ante secundam horam est.
No. There are hours on a sundial, so the day lasts from sunrise to sunset.
If we are speaking on an equinox, say, and the sun rises at 7 AM and sets at 7 PM. The first hour would be 7 AM to 8 AM.
This means that the hours were different lengths depending on the time of year, but that was OK because in the ancient world the concept of needing to do some thing in an exact amount of time was not an every day occurrence. Without an accurate and absolute way to tell time things were much more relative. “We will meet in the third hour” means that we will meet around mid morning, and we can tell when that is based on where the sun is in the sky. But it would be much harder to plan a meeting in a specific amount of time without extra tools like our classes at one’s disposal.